zephyr: driver: bbram_npcx: Add Kconfig description
This adds Kconfig description for CROS_BBRAM_NPCX.
BRANCH=none
TEST=zmake testall
@@ -7,7 +7,8 @@ menuconfig CROS_BBRAM_NPCX
depends on SOC_FAMILY_NPCX
default y
help
- This options enables stuff.
+ This enables the NPCX cros_bbram driver. The NPCX BBRAM module
+ provides 128 bytes of battery-backed memory area.
if CROS_BBRAM_NPCX
