ArmPkg/ArmGicDxe: Validate GICv2 interrupt source

GicV2RegisterInterruptSource() forms a pointer into the registered
interrupt handler array before the source is validated by the enable or
disable path. An unsupported source can therefore cause an out-of-bounds
access in GicCommonRegisterInterruptSource().

Validate the source against the supported GIC interrupt count before
indexing the handler array and return EFI_UNSUPPORTED for an invalid
source. Document the source validation helper and the registration
function, including its parameters, unregistration behavior and return
values.

Signed-off-by: Kajal Agarwal <kajal.agarwal@arm.com>

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