[nrfconnect] Moved 54L specific configs to defaults

Increased the malloc heap size for 54L and moved MPSL stack
size config to defaults, as it was set in all Matter samples.

Signed-off-by: Kamil Kasperczyk <kamil.kasperczyk@nordicsemi.no>

config/nrfconnect/chip-module/Kconfig.defaults

@@ -60,8 +60,12 @@ config HEAP_MEM_POOL_IGNORE_MIN
     default y if CHIP_WIFI
 
 config CHIP_MALLOC_SYS_HEAP_SIZE
+    default 10240 if SOC_SERIES_NRF54LX # nRF54L requires more memory due to crypto backend
     default 8192 if NET_L2_OPENTHREAD
 
+config MPSL_WORK_STACK_SIZE
+    default 2048 if SOC_SERIES_NRF54LX # nRF54L requires more memory due to crypto backend
+
 # We use sys_heap based allocators, so make sure we don't reserve unused libc heap anyway
 config COMMON_LIBC_MALLOC_ARENA_SIZE
     default -1