feat(rdfremont): Initialize GPT on GPC SMMU block

GPC SMMU does GPC checks for accesses originating from the system
control block and GIC of RD-Fremont platforms. The GPC check on this is
disabled by the boot firmware. Configure GPC SMMU to initialize the GPC.

Unlike the SMMU in the IO Virt block, the transactions should be allowed
for this block. So update the SMMUv3 driver with a flag to indicate
whether the transactions should be aborted or not while initializing an
SMMU.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>