Revert "[nrf fromlist] boards: nordic: nrf54l15pdk: Disable asserts on flpr"

This reverts commit a278ee4.

Signed-off-by: Grzegorz Swiderski <[email protected]>

Author: 57300

boards/nordic/nrf54l15pdk/Kconfig.defconfig

@@ -10,11 +10,3 @@ config ROM_START_OFFSET
 	default 0x800 if BOOTLOADER_MCUBOOT
 
 endif # BOARD_NRF54L15PDK_NRF54L15_CPUAPP
-
-if BOARD_NRF54L15PDK_NRF54L15_CPUFLPR || BOARD_NRF54L15PDK_NRF54L15_CPUFLPR_XIP
-
-# As FLPR has limited memory most of tests does not fit with asserts enabled.
-config ASSERT
-	default n if ZTEST
-
-endif # BOARD_NRF54L15PDK_NRF54L15_CPUFLPR || BOARD_NRF54L15PDK_NRF54L15_CPUFLPR_XIP