drivers: serial: simplify Kconfig.nrfx by using HAS_HW_NRF_UART0
drivers: serial: simplify Kconfig.nrfx by using HAS_HW_NRF_UART0

Condition:
depends on ((SOC_SERIES_NRF52X || SOC_SERIES_NRF51X) && (!SOC_NRF52810))
for displaing configuration for UART0 peripheral has been replaced with:
depends on HAS_HW_NRF_UART0.

Signed-off-by: Jakub Rzeszutko <db01fea5b4491dba4fc272e7096cf665c7b907b9@nordicsemi.no>

GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,kraj/zephyr,ldts/zephyr,ldts/zephyr,kraj/zephyr,explora26/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,explora26/zephyr,nashif/zephyr,explora26/zephyr,punitvara/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,ldts/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,nashif/zephyr,explora26/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,ldts/zephyr,finikorg/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,kraj/zephyr,galak/zephyr,punitvara/zephyr,Vudentz/zephyr,nashif/zephyr