Revert "samples: lwm2m_client: Add missing kconfig to overlay"

This reverts commit 477c413.

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

samples/cellular/lwm2m_client/overlay-mcumgr_client.conf

@@ -24,6 +24,3 @@ CONFIG_UART_MCUMGR_RX_BUF_COUNT=4
 CONFIG_LWM2M_RW_SENML_CBOR_RECORDS=55
 # Extend System Workqueue stack size
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2304
-
-# Enable MCUboot hooks
-CONFIG_BOOT_IMAGE_ACCESS_HOOKS=y