bluetooth: fix GATT database hash done too many times
bluetooth: fix GATT database hash done too many times

Submit GATT database hash as a delayed work to prevent it being run
twice if we register dynamic services.

Signed-off-by: François Delawarde <f957da5b594b0b24fbb562a75e0fedb85824b721@oticon.com>

galak/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr