fix(plat/rcar3): fix source file to make about GICv2
fix(plat/rcar3): fix source file to make about GICv2

Changed the plat/renesas/common/common.mk to change the source files
about GICv2 by include gicv2.mk, because gic_common.c has deprecated.

Signed-off-by: Hideyuki Nitta <157a8d8ef8f394e865e6e7e05394892c6ab1e8cd@hitachi.com>
Signed-off-by: Toshiyuki Ogasahara <400c4e7a7839959b6b07a73f04007ccb4fab1369@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <d86d911fdf74bc568916e51d62d67d57b0acd5dd@renesas.com>
Change-Id: Iaa7eae6b2c1dd79a05339325e6bc422d87bce49e

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware