[nrf noup] boot: zephyr: Align serial recovery config on Thingy:91

Change removes the legacy configuration. The legacy configuration
became problematic, because GPIO DTS nodes no longer support labels
that were used to identify nodes in MCUboot. Therefore we need to
use GPIO DTS node name with the legacy approach.

The GPIO should be configured by board's DTS, which is simpler.

Jira: NCSDK-16550

Signed-off-by: Marek Pieta <[email protected]>
(cherry picked from commit bf00840)

Author: MarekPieta

boot/zephyr/boards/thingy91_nrf52840.conf

@@ -19,9 +19,6 @@ CONFIG_UART_LINE_CTRL=y
 CONFIG_GPIO=y
 CONFIG_MCUBOOT_SERIAL=y
 CONFIG_BOOT_SERIAL_CDC_ACM=y
-CONFIG_BOOT_SERIAL_DETECT_PORT="GPIO_1"
-CONFIG_BOOT_SERIAL_DETECT_PIN=13
-CONFIG_BOOT_SERIAL_DETECT_PIN_VAL=0
 
 # Required by USB
 CONFIG_MULTITHREADING=y

boot/zephyr/boards/thingy91_nrf9160.conf

@@ -11,6 +11,3 @@ CONFIG_BOOT_MAX_IMG_SECTORS=256
 
 # MCUboot serial recovery
 CONFIG_MCUBOOT_SERIAL=y
-CONFIG_BOOT_SERIAL_DETECT_PORT="GPIO_0"
-CONFIG_BOOT_SERIAL_DETECT_PIN=26
-CONFIG_BOOT_SERIAL_DETECT_PIN_VAL=0