ARM: dts: sun6i: Remove redundant MMC pinmux tuning

Some boards override the MMC pin muxing settings in order to enable the
pull-ups and change the drive strength to a value higher than the default.

While this was needed in the earlier days, this is now the default setting
for those pins, and therefore we don't need those board-specific settings
anymore.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

arch/arm/boot/dts/sun6i-a31-colombus.dts

@@ -121,10 +121,6 @@ &mmc0 {
 	status = "okay";
 };
 
-&mmc0_pins_a {
-	bias-pull-up;
-};
-
 &pio {
 	i2c_lcd_pins: i2c_lcd_pin@0 {
 		pins = "PA23", "PA24";

arch/arm/boot/dts/sun6i-a31-hummingbird.dts

@@ -222,11 +222,6 @@ &mmc0 {
 	status = "okay";
 };
 
-&mmc0_pins_a {
-	/* external pull-ups missing for some pins */
-	bias-pull-up;
-};
-
 &mmc1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc1_pins_a>;

arch/arm/boot/dts/sun6i-a31s-sinovoip-bpi-m2.dts

@@ -120,10 +120,6 @@ &mmc0 {
 	status = "okay";
 };
 
-&mmc0_pins_a {
-	bias-pull-up;
-};
-
 &mmc2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&mmc2_pins_a>;
@@ -142,10 +138,6 @@ brcmf: wifi@1 {
 	};
 };
 
-&mmc2_pins_a {
-	bias-pull-up;
-};
-
 &ohci0 {
 	status = "okay";
 };

arch/arm/boot/dts/sun6i-a31s-yones-toptech-bs1078-v2.dts

@@ -98,10 +98,6 @@ &mmc0 {
 	status = "okay";
 };
 
-&mmc0_pins_a {
-	bias-pull-up;
-};
-
 &p2wi {
 	status = "okay";