samples: bootloader: fix prj_minimal overflow

Since NCS 2.7.0 when building NSIB a flash overflow
occured when building in the minimal configuration
(with prj_minimal.conf).
This happened due to NCS_BOOT_BANNER (and in turn
PRINTK) being enabled by default.
This commit fixes it.

Signed-off-by: Artur Hadasz <[email protected]>

Author: ahasztag

samples/bootloader/prj_minimal.conf

@@ -30,6 +30,7 @@ CONFIG_MULTITHREADING=n
 CONFIG_NCS_SAMPLES_DEFAULTS=n
 CONFIG_NRF_ENABLE_ICACHE=n
 CONFIG_PRINTK=n
+CONFIG_NCS_BOOT_BANNER=n
 CONFIG_RESET_ON_FATAL_ERROR=n
 CONFIG_LOG=n
 CONFIG_SERIAL=n