rcar_gen3: drivers: cpld: Move rcar_cpld_reset_cpu() into header

Move the rcar_cpld_reset_cpu() function into header file and zap the externs.

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 b897601..5d1f5f6 100644
--- a/plat/renesas/rcar/platform.mk
+++ b/plat/renesas/rcar/platform.mk
@@ -311,6 +311,7 @@
 			-Idrivers/staging/renesas/rcar/qos	\
 			-Idrivers/renesas/rcar/iic_dvfs		\
 			-Idrivers/renesas/rcar/board		\
+			-Idrivers/renesas/rcar/cpld/		\
 			-Idrivers/renesas/rcar/avs		\
 			-Idrivers/renesas/rcar/delay		\
 			-Idrivers/renesas/rcar/rom		\