fix(gic): fix gic_v2 spi irq handling

With commit@055adff8d7e5431174672c7aac0bc530c4e7a778
check for is_plat_spi was removed in `tftf_irq_enable` this is
correctly handled from re-routing but not the case in gic_v2 handling.

Change-Id: Id22f2dcc5d9de3950bc210139869ff284c636719
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
1 file changed