pinctrl: renesas: r8a77951: Add R8A774E1 PFC support

Renesas RZ/G2H (r8a774e1) is pin compatible with R-Car H3 (r8a77951),
however it doesn't have several automotive specific peripherals. Add
a r8a77951 specific pin groups/functions along with common pin
groups/functions for supporting both r8a77951 and r8a774e1 SoC.

PFC changes are synced from mainline linux-5.9 commit
bbf5c979011a ("Linux 5.9").

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
diff --git a/drivers/pinctrl/renesas/Kconfig b/drivers/pinctrl/renesas/Kconfig
index 0d839ee..d2be4c8 100644
--- a/drivers/pinctrl/renesas/Kconfig
+++ b/drivers/pinctrl/renesas/Kconfig
@@ -77,6 +77,16 @@
           the GPIO definitions and pin control functions for each available
           multiplex function.
 
+config PINCTRL_PFC_R8A774E1
+        bool "Renesas RZ/G2 R8A774E1 pin control driver"
+        depends on PINCTRL_PFC
+        help
+          Support pin multiplexing control on Renesas RZ/G2H R8A774E1 SoCs.
+
+          The driver is controlled by a device tree node which contains both
+          the GPIO definitions and pin control functions for each available
+          multiplex function.
+
 config PINCTRL_PFC_R8A7795
 	bool "Renesas RCar Gen3 R8A7795 pin control driver"
 	depends on PINCTRL_PFC