arm: rmobile: Restrict PINCTRL_PFC selection to R-Car gen3/gen4

The RZ/G2L family uses CONFIG_RCAR_64 but does not share a common PFC
driver with the R-Car gen3 & gen4 boards.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/arch/arm/mach-rmobile/Kconfig b/arch/arm/mach-rmobile/Kconfig
index c5419e8..af1f991 100644
--- a/arch/arm/mach-rmobile/Kconfig
+++ b/arch/arm/mach-rmobile/Kconfig
@@ -9,7 +9,6 @@
 	select PHY
 	select PINCONF
 	select PINCTRL
-	select PINCTRL_PFC
 	select POSITION_INDEPENDENT
 	imply CMD_FS_UUID
 	imply CMD_GPT
@@ -29,6 +28,7 @@
 	bool "Renesas ARM SoCs R-Car Gen3 (64bit)"
 	select RCAR_64
 	select SUPPORT_SPL
+	select PINCTRL_PFC
 	imply SPL
 	imply SPL_BOARD_INIT
 	imply SPL_GZIP
@@ -43,6 +43,7 @@
 config RCAR_GEN4
 	bool "Renesas ARM SoCs R-Car Gen4 (64bit)"
 	select RCAR_64
+	select PINCTRL_PFC
 
 config RZA1
 	prompt "Renesas ARM SoCs RZ/A1 (32bit)"