dts: arm: stm32g0: Have the stm32g071 inherit from stm32g070
dts: arm: stm32g0: Have the stm32g071 inherit from stm32g070

The g071 is a superset of the g070. This change reflects
that relationship.

Signed-off-by: Eric Hay <53ae4a0ed18f6a043d4e0a0dc4af063aa00d0eb1@sierrawireless.com>

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