fix incorrect condition

Author: Moshe Shahar

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_K66F/device/TOOLCHAIN_ARM_STD/MK66FN2M0xxx18.sct

@@ -65,7 +65,7 @@
 #define m_interrupts_start             MBED_APP_START
 #define m_interrupts_size              0x00000400
 
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
 
 #define m_flash_config_start           MBED_APP_START + 0x400
 #define m_flash_config_size            0x00000010
@@ -111,7 +111,7 @@ LR_IROM1 m_interrupts_start m_text_start+m_text_size-m_interrupts_start {   ; lo
   VECTOR_ROM m_interrupts_start m_interrupts_size { ; load address = execution address
     * (RESET,+FIRST)
   }
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   ER_m_flash_config m_flash_config_start FIXED m_flash_config_size { ; load address = execution address
     * (FlashConfig)
   }

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_K66F/device/TOOLCHAIN_GCC_ARM/MK66FN2M0xxx18.ld

@@ -74,7 +74,7 @@ M_CRASH_DATA_RAM_SIZE = 0x100;
 /* Specify the memory areas */
 MEMORY
 {
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   m_interrupts          (RX)  : ORIGIN = MBED_APP_START, LENGTH = 0x400
   m_flash_config        (RX)  : ORIGIN = MBED_APP_START + 0x400, LENGTH = 0x10
   m_text                (RX)  : ORIGIN = MBED_APP_START + 0x410, LENGTH = MBED_APP_SIZE - 0x410
@@ -95,7 +95,7 @@ SECTIONS
     . = ALIGN(8);
     KEEP(*(.isr_vector))     /* Startup code */
     . = ALIGN(8);
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   } > m_interrupts
 
   .flash_config :

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/device/TOOLCHAIN_ARM_STD/MK64FN1M0xxx12.sct

@@ -57,6 +57,7 @@
 #endif
 
 #if !defined(MBED_APP_START)
+
   #define MBED_APP_START 0
 #elif MBED_APP_START > 0 && MBED_APP_START < 0x410
     #error MBED_APP_START too small and will overwrite interrupts and flash config
@@ -77,7 +78,7 @@
 #define m_interrupts_start             MBED_APP_START
 #define m_interrupts_size              0x00000400
 
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
 
 #define m_flash_config_start           MBED_APP_START + 0x400
 #define m_flash_config_size            0x00000010
@@ -115,7 +116,7 @@ LR_IROM1 m_interrupts_start m_text_start+m_text_size-m_interrupts_start { ; load
   VECTOR_ROM m_interrupts_start m_interrupts_size { ; load address = execution address
     * (RESET,+FIRST)
   }
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   ER_m_flash_config m_flash_config_start FIXED m_flash_config_size { ; load address = execution address
     * (FlashConfig)
   }

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/device/TOOLCHAIN_GCC_ARM/MK64FN1M0xxx12.ld

@@ -76,7 +76,7 @@ M_CRASH_DATA_RAM_SIZE = 0x100;
 /* Specify the memory areas */
 MEMORY
 {
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   m_interrupts          (RX)  : ORIGIN = MBED_APP_START, LENGTH = 0x400
   m_flash_config        (RX)  : ORIGIN = MBED_APP_START + 0x400, LENGTH = 0x10
   m_text                (RX)  : ORIGIN = MBED_APP_START + 0x410, LENGTH = MBED_APP_SIZE - 0x410
@@ -97,7 +97,7 @@ SECTIONS
     . = ALIGN(8);
     KEEP(*(.isr_vector))     /* Startup code */
     . = ALIGN(8);
-#if MBED_APP_SIZE == 0
+#if MBED_APP_START == 0
   } > m_interrupts
 
   .flash_config :