cosmetic: rockchip: rk3288: pinctrl: fix config symbol naming

Revise config to CONFIG_ROCKCHIP_RK3288_PINCTRL.

Signed-off-by: Ziyuan Xu <jk.kernel@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>

configs/evb-rk3288_defconfig

@@ -46,7 +46,7 @@ CONFIG_PINCTRL=y
 # CONFIG_PINCTRL_FULL is not set
 CONFIG_SPL_PINCTRL=y
 # CONFIG_SPL_PINCTRL_FULL is not set
-CONFIG_ROCKCHIP_PINCTRL=y
+CONFIG_ROCKCHIP_RK3288_PINCTRL=y
 CONFIG_DM_PMIC=y
 CONFIG_PMIC_ACT8846=y
 CONFIG_DM_REGULATOR=y