mips: ralink: make SOC_MT7621 select PINCTRL

Currently, out of every Ralink SoC, only the dt-binding of the MT7621 SoC
uses pinctrl. Because of this, PINCTRL is not selected at all. Make
SOC_MT7621 select PINCTRL.

Remove PINCTRL_MT7621, enabling it for the MT7621 SoC will be handled under
the PINCTRL_MT7621 option.
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/ralink/Kconfig

@@ -54,7 +54,7 @@ choice
 		select HAVE_PCI
 		select PCI_DRIVERS_GENERIC
 		select SOC_BUS
-		select PINCTRL_MT7621
+		select PINCTRL
 
 		help
 		  The MT7621 system-on-a-chip includes an 880 MHz MIPS1004Kc