rcar_gen3: drivers: pwrc: Switch to common delay implementation

Replace the ad-hoc implementation of delay in PWRC driver
with common R-Car delay code.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
diff --git a/plat/renesas/rcar/platform.mk b/plat/renesas/rcar/platform.mk
index 26f3c34..b9c0802 100644
--- a/plat/renesas/rcar/platform.mk
+++ b/plat/renesas/rcar/platform.mk
@@ -378,6 +378,7 @@
 			plat/renesas/rcar/plat_pm.c			\
 			drivers/renesas/rcar/console/rcar_console.S	\
 			drivers/renesas/rcar/console/rcar_printf.c	\
+			drivers/renesas/rcar/delay/micro_delay.c	\
 			drivers/renesas/rcar/pwrc/call_sram.S		\
 			drivers/renesas/rcar/pwrc/pwrc.c		\
 			drivers/renesas/rcar/common.c			\