ARM: dts: imx28: add alternative muxing for mmc2_sck_cfg

Signed-off-by: Michael Heimpold <[e-mail]>
Cc: Stefan Wahren <[e-mail]>
Acked-by: Stefan Wahren <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx28.dtsi

···
 					fsl,pull-up = <MXS_PULL_DISABLE>;
 				};
 
+				mmc2_sck_cfg_b: mmc2-sck-cfg@1 {
+					reg = <1>;
+					fsl,pinmux-ids = <
+						MX28_PAD_SSP2_SCK__SSP2_SCK
+					>;
+					fsl,drive-strength = <MXS_DRIVE_12mA>;
+					fsl,pull-up = <MXS_PULL_DISABLE>;
+				};
+
 				i2c0_pins_a: i2c0@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <