rockchip: Move pull-up/down enum into a common file

At present this enum is only available to rk3288. Move it so that other
rockchip SoCs can access it. It is needed for the SPL GPIO driver for
rk3999 in a later patch.

Also adjust the enum name to lower case.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/include/asm/arch-rockchip/gpio.h

@@ -24,4 +24,11 @@ struct rockchip_gpio_regs {
 };
 check_member(rockchip_gpio_regs, ls_sync, 0x60);
 
+enum gpio_pu_pd {
+	GPIO_PULL_NORMAL = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_REPEAT,
+};
+
 #endif

arch/arm/include/asm/arch-rockchip/grf_rk3288.h

@@ -1149,13 +1149,6 @@ enum GPIO_BIAS {
 #define GPIO_BIAS_MASK	0x3
 #define GPIO_BIAS_SHIFT(x)  ((x) * 2)
 
-enum GPIO_PU_PD {
-	GPIO_PULL_NORMAL = 0,
-	GPIO_PULL_UP,
-	GPIO_PULL_DOWN,
-	GPIO_PULL_REPEAT,
-};
-
 #define GPIO_PULL_MASK	0x3
 #define GPIO_PULL_SHIFT(x)  ((x) * 2)