target TT_: fix compilation errors

They define slave for spi, rtc but do not contain implementation - removing them.
Fixes #11143

Author: 0xc0170

targets/targets.json

@@ -8860,15 +8860,11 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
-            "RTC",
             "SERIAL",
             "SLEEP",
             "SPI",
-            "SPISLAVE",
-            "SPI_ASYNCH",
             "I2C",
             "I2CSLAVE",
-            "I2C_ASYNCH",
             "STDIO_MESSAGES",
             "MPU"
         ],