Disable RF52_DK as they require LPTICKER for flash and trng

Author: bulislaw

targets/targets.json

@@ -3488,7 +3488,7 @@
         "inherits": ["MCU_NRF52"],
         "macros_add": ["BOARD_PCA10040", "NRF52_PAN_12", "NRF52_PAN_15", "NRF52_PAN_58", "NRF52_PAN_55", "NRF52_PAN_54", "NRF52_PAN_31", "NRF52_PAN_30", "NRF52_PAN_51", "NRF52_PAN_36", "NRF52_PAN_53", "S132", "CONFIG_GPIO_AS_PINRESET", "BLE_STACK_SUPPORT_REQD", "SWI_DISABLE0", "NRF52_PAN_20", "NRF52_PAN_64", "NRF52_PAN_62", "NRF52_PAN_63"],
         "device_has_add": ["ANALOGIN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE", "FLASH"],
-        "release_versions": ["2", "5"],
+        "release_versions": ["2"],
         "device_name": "nRF52832_xxAA"
     },
     "UBLOX_EVA_NINA": {
@@ -3615,7 +3615,7 @@
         "inherits": ["MCU_NRF52840"],
         "macros_add": ["BOARD_PCA10056", "CONFIG_GPIO_AS_PINRESET", "SWI_DISABLE0", "NRF52_ERRATA_20"],
         "device_has_add": ["FLASH", "ANALOGIN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "TRNG"],
-        "release_versions": ["2", "5"],
+        "release_versions": ["2"],
         "device_name": "nRF52840_xxAA",
         "bootloader_supported": true
     },