soc: qemu_cortex_a53: remove pl011 entry from mmu_regions array
soc: qemu_cortex_a53: remove pl011 entry from mmu_regions array

pl011 driver uses the new device model and maps the mmio space,
so there is no need anymore to add the entry to the mmu_region
array.

Signed-off-by: Luca Fancellu <42e9678da03ff0f0455459bc75b0f3b90bcef2e6@arm.com>

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