xilinx: Fix xlnx,mio_bank property

s/xlnx,mio_bank/xlnx,mio-bank/g

DT binding is describing mio-bank not mio_bank that's why fix all DTSes and
also driver itself.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Peng Fan <peng.fan@nxp.com>

diff --git a/arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts b/arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts
index 0805b93..e2428ec 100644
--- a/arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts
+++ b/arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts
@@ -148,7 +148,7 @@
 &sdhci0 {
 	status = "okay";
 	bus-width = <8>;
-	xlnx,mio_bank = <0>;
+	xlnx,mio-bank = <0>;
 };
 
 /* SD1 with level shifter */
@@ -158,7 +158,7 @@
 	 * This property should be removed for supporting UHS mode
 	 */
 	no-1-8-v;
-	xlnx,mio_bank = <1>;
+	xlnx,mio-bank = <1>;
 };
 
 &uart0 {