Ensure storage feature is not added to K66F

Author: Mac Lobdell

targets/targets.json

@@ -707,7 +707,6 @@
         "inherits": ["Target"],
         "detect_code": ["0311"],
         "device_has": ["USTICKER", "LPTICKER", "RTC", "ANALOGIN", "ANALOGOUT", "EMAC", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "TRNG", "FLASH"],
-        "features": ["STORAGE"],
         "release_versions": ["2", "5"],
         "device_name": "MK66FN2M0xxx18",
         "bootloader_supported": true,