[nrf noup] boot: prj_minimal.conf: s/SYS_POWER_MANAGEMENT/PM/

Use CONFIG_PM instead of the deprecated CONFIG_SYS_POWER_MANAGEMENT.

noup because the entire file is noup

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
(cherry picked from commit 9cc37cc)

Author: SebastianBoe

boot/zephyr/prj_minimal.conf

@@ -9,7 +9,7 @@ CONFIG_MBEDTLS_CFG_FILE="mcuboot-mbedtls-cfg.h"
 
 CONFIG_FLASH=y
 CONFIG_FPROTECT=y
-CONFIG_SYS_POWER_MANAGEMENT=n
+CONFIG_PM=n
 
 CONFIG_BOOT_ENCRYPT_EC256=n
 CONFIG_BOOT_ENCRYPT_RSA=n