Rebase of 7e8cfa8

[NRF52840]: fix SdBlockDevice capability device by disabling SPI_ASYNC mode.

Author: nvlsianpu

targets/targets.json

@@ -2806,7 +2806,7 @@
         "supported_form_factors": ["ARDUINO"],
         "inherits": ["MCU_NRF52840"],
         "macros_add": ["BOARD_PCA10056", "CONFIG_GPIO_AS_PINRESET", "SWI_DISABLE0", "NRF52_ERRATA_20"],
-        "device_has": ["FLASH", "ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE", "TRNG"],
+        "device_has": ["FLASH", "ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "TRNG"],
         "release_versions": ["2", "5"],
         "device_name": "nRF52840_xxAA"
     },