MIMXRT: define PullUp default value

This target defines few PullUp values, one should be defined to be PullUp that
an application can use. We use the same value as PullDefault

Author: 0xc0170

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PinNames.h

@@ -217,7 +217,8 @@ typedef enum {
     PullUp_47K  = 2,
     PullUp_100K = 3,
     PullUp_22K  = 4,
-    PullDefault = PullUp_47K
+    PullDefault = PullUp_47K,
+    PullUp = PullUp_47K
 } PinMode;
 
 #ifdef __cplusplus