zephyr: Explicitly select CONFIG_CRC for CONFIG_MCUBOOT_SERIAL
The serial recovery depends on CRC from Zephyr, which it should
have been selecting explicitly.
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
diff --git a/boot/zephyr/Kconfig.serial_recovery b/boot/zephyr/Kconfig.serial_recovery
index eabebfa..e254ede 100644
--- a/boot/zephyr/Kconfig.serial_recovery
+++ b/boot/zephyr/Kconfig.serial_recovery
@@ -13,6 +13,7 @@
select SERIAL
select UART_INTERRUPT_DRIVEN
select BASE64
+ select CRC
help
If y, enables a serial-port based update mode. This allows
MCUboot itself to load update images into flash over a UART.