[nrf noup] boot: prj_minimal.conf: rm CONFIG_SYSTEM_CLOCK_DISABLE

Remove CONFIG_SYSTEM_CLOCK_DISABLE, which no longer exists.

noup because the entire file is noup.

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
(cherry picked from commit 5b4aeb3)

Author: SebastianBoe

boot/zephyr/prj_minimal.conf

@@ -10,7 +10,6 @@ CONFIG_MBEDTLS_CFG_FILE="mcuboot-mbedtls-cfg.h"
 CONFIG_FLASH=y
 CONFIG_FPROTECT=y
 CONFIG_SYS_POWER_MANAGEMENT=n
-CONFIG_SYSTEM_CLOCK_DISABLE=y
 
 CONFIG_BOOT_ENCRYPT_EC256=n
 CONFIG_BOOT_ENCRYPT_RSA=n