rockchip: pinctrl: use per-SoC option names for Kconfig

The config options for pinctrl on the RK3188, RK3288, RK3328 and
RK3399 previously showed up in menuconfig with the generic string
descriptor "Rockchip pin control driver" requiring one to look through
the help/full description to identify which chip each menu entry was
for.

This change renames each option with the chip-name in the description
string to make it easy to identify the configuration options in
menuconfig.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/pinctrl/Kconfig

@@ -133,7 +133,7 @@ config ROCKCHIP_RK3036_PINCTRL
 	  function.
 
 config ROCKCHIP_RK3188_PINCTRL
-	bool "Rockchip pin control driver"
+	bool "Rockchip rk3188 pin control driver"
 	depends on DM
 	help
 	  Support pin multiplexing control on Rockchip rk3188 SoCs. The driver
@@ -142,7 +142,7 @@ config ROCKCHIP_RK3188_PINCTRL
 	  function.
 
 config ROCKCHIP_RK3288_PINCTRL
-	bool "Rockchip pin control driver"
+	bool "Rockchip rk3288 pin control driver"
 	depends on DM
 	help
 	  Support pin multiplexing control on Rockchip rk3288 SoCs. The driver
@@ -158,7 +158,7 @@ config PINCTRL_AT91PIO4
 	  controller which is available on SAMA5D2 SoC.
 
 config ROCKCHIP_RK3328_PINCTRL
-	bool "Rockchip pin control driver"
+	bool "Rockchip rk3328 pin control driver"
 	depends on DM
 	help
 	  Support pin multiplexing control on Rockchip rk3328 SoCs. The driver
@@ -167,7 +167,7 @@ config ROCKCHIP_RK3328_PINCTRL
 	  function.
 
 config ROCKCHIP_RK3399_PINCTRL
-	bool "Rockchip pin control driver"
+	bool "Rockchip rk3399 pin control driver"
 	depends on DM
 	help
 	  Support pin multiplexing control on Rockchip rk3399 SoCs. The driver