ARM: dts: Drop legacy custom hwmods property for omap4 mmc

With recent ti-sysc driver changes, we can now finally probe most
modules without needing the custom ti,hwmods property.

Let's drop it for omap4 MMC as we can test that for runtime PM
for core retention idle mode for wlcore WLAN.

Cc: devicetree@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap4-l4.dtsi

@@ -2103,7 +2103,6 @@ mcspi2: spi@0 {
 
 		target-module@9c000 {			/* 0x4809c000, ap 53 36.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc1";
 			reg = <0x9c000 0x4>,
 			      <0x9c010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2171,7 +2170,6 @@ target-module@a8000 {			/* 0x480a8000, ap 61 3e.0 */
 
 		target-module@ad000 {			/* 0x480ad000, ap 63 50.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc3";
 			reg = <0xad000 0x4>,
 			      <0xad010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2237,7 +2235,6 @@ hdqw1w: 1w@0 {
 
 		target-module@b4000 {			/* 0x480b4000, ap 67 46.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc2";
 			reg = <0xb4000 0x4>,
 			      <0xb4010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2332,7 +2329,6 @@ mcspi4: spi@0 {
 
 		target-module@d1000 {			/* 0x480d1000, ap 73 44.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc4";
 			reg = <0xd1000 0x4>,
 			      <0xd1010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2365,7 +2361,6 @@ mmc4: mmc@0 {
 
 		target-module@d5000 {			/* 0x480d5000, ap 75 4e.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc5";
 			reg = <0xd5000 0x4>,
 			      <0xd5010 0x4>;
 			reg-names = "rev", "sysc";