ARM: omap3: evm: Update DM SPL support

- Switch to using the omap3-u-boot.dtsi file for needed properties
- Enable SPL_OF_CONTROL

This commit is based on the following series:

https://patchwork.ozlabs.org/project/uboot/list/?series=92472
https://patchwork.ozlabs.org/project/uboot/list/?series=92462

Signed-off-by: Derald D. Woods <woods.technical@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/omap3-evm-37xx-u-boot.dtsi b/arch/arm/dts/omap3-evm-37xx-u-boot.dtsi
index de41131..b9e433f 100644
--- a/arch/arm/dts/omap3-evm-37xx-u-boot.dtsi
+++ b/arch/arm/dts/omap3-evm-37xx-u-boot.dtsi
@@ -5,20 +5,10 @@
  * (C) Copyright 2017 Derald D. Woods <woods.technical@gmail.com>
  */
 
+#include "omap3-u-boot.dtsi"
+
 / {
 	chosen {
 		stdout-path = &uart1;
 	};
 };
-
-&uart1 {
-	reg-shift = <2>;
-};
-
-&uart2 {
-	reg-shift = <2>;
-};
-
-&uart3 {
-	reg-shift = <2>;
-};