pinctrl: renesas: r8a77965: Add R8A774B1 PFC support

Renesas RZ/G2N (r8a774b1) is pin compatible with R-Car M3-N (r8a77965),
however it doesn't have several automotive specific peripherals. Add
a r8a77965 specific pin groups/functions along with common pin
groups/functions for supporting both r8a77965 and r8a774b1 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 e14294b..0d839ee 100644
--- a/drivers/pinctrl/renesas/Kconfig
+++ b/drivers/pinctrl/renesas/Kconfig
@@ -67,6 +67,16 @@
           the GPIO definitions and pin control functions for each available
           multiplex function.
 
+config PINCTRL_PFC_R8A774B1
+        bool "Renesas RZ/G2 R8A774B1 pin control driver"
+        depends on PINCTRL_PFC
+        help
+          Support pin multiplexing control on Renesas RZ/G2N R8A774B1 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