cosmetic: rockchip: rk3036: pinctrl: fix config symbol naming

Rockchip socs are always named rkxxxx in all places, as also shown
by the naming of the rk3036 pinctrl file itself.
Therefore also name the config symbol according to this scheme.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 85dddd3..951a922 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -132,7 +132,7 @@
 	  definitions and pin control functions for each available multiplex
 	  function.
 
-config ROCKCHIP_3036_PINCTRL
+config ROCKCHIP_RK3036_PINCTRL
 	bool "Rockchip rk3036 pin control driver"
 	depends on DM
 	help