drivers: renesas: rzg: Switch using common ddr code

Switch using common ddr driver code from renesas/common/ddr directory
for RZ/G2M SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Change-Id: I807dcb0bc5186bd32bc1c577945d28634bb10e1f
diff --git a/drivers/renesas/rzg/qos/qos_init.c b/drivers/renesas/rzg/qos/qos_init.c
index 2d5aece..2d0bb1f 100644
--- a/drivers/renesas/rzg/qos/qos_init.c
+++ b/drivers/renesas/rzg/qos/qos_init.c
@@ -48,7 +48,7 @@
 	uint32_t i;
 
 	qos_init_ddr_ch = 0U;
-	qos_init_ddr_phyvalid = rzg_get_boardcnf_phyvalid();
+	qos_init_ddr_phyvalid = get_boardcnf_phyvalid();
 	for (i = 0U; i < DRAM_CH_CNT; i++) {
 		if ((qos_init_ddr_phyvalid & (1U << i))) {
 			qos_init_ddr_ch++;