interrupts: Do not assert on IRQ enable status for ISR install on GIC
interrupts: Do not assert on IRQ enable status for ISR install on GIC

The current `z_isr_install` implementation asserts that the IRQ to
which the ISR will be installed must be disabled.

This commit disables that assertion for the ARM GIC because the SGI-
type IRQs can never be disabled as per the specifications and this
causes the assertion to fail for them.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

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