ARM: dts: Drop legacy custom hwmods property for dra7 mmc

With recent ti-sysc driver changes, we can probe most devices with device
tree data only and drop the custom "ti,hwmods" property.

We have already added the related device tree data earlier, and have
already dropped the platform data. But we have been still dynamically
allocating the platform data based on "ti,hwmods" property. With recent
ti-sysc driver changes this is no longer needed.
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra7-l4.dtsi

@@ -2004,7 +2004,6 @@
 
 		target-module@9c000 {			/* 0x4809c000, ap 51 38.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc1";
 			reg = <0x9c000 0x4>,
 			      <0x9c010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2064,7 +2063,6 @@
 
 		target-module@ad000 {			/* 0x480ad000, ap 61 20.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc3";
 			reg = <0xad000 0x4>,
 			      <0xad010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2124,7 +2122,6 @@
 
 		target-module@b4000 {			/* 0x480b4000, ap 65 40.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc2";
 			reg = <0xb4000 0x4>,
 			      <0xb4010 0x4>;
 			reg-names = "rev", "sysc";
@@ -2223,7 +2220,6 @@
 
 		target-module@d1000 {			/* 0x480d1000, ap 71 28.0 */
 			compatible = "ti,sysc-omap4", "ti,sysc";
-			ti,hwmods = "mmc4";
 			reg = <0xd1000 0x4>,
 			      <0xd1010 0x4>;
 			reg-names = "rev", "sysc";