rpi4: Switch to gicv2.mk and GICV2_SOURCES

Addresses the deprecation warning produced by
drivers/arm/gic/common/gic_common.c.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Change-Id: I1a3ff4835d0f94c74b405db10622e99875ded82b
1 file changed