ARM: dts: omap3-beagle{-xm}: Add support for BeagleBoard

This commit adds OMAP3 BeagleBoard devicetree files from
Linux v4.15-rc5. This includes standard OMAP34XX board revisions as
well as the 'xM' which is OMAP36XX.

Signed-off-by: Derald D. Woods <woods.technical@gmail.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 7162da4..9540ba4 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -446,6 +446,11 @@
 	omap3-evm-37xx.dtb \
 	omap3-evm.dtb
 
+dtb-$(CONFIG_TARGET_OMAP3_BEAGLE) += \
+	omap3-beagle-xm-ab.dtb \
+	omap3-beagle-xm.dtb \
+	omap3-beagle.dtb
+
 dtb-$(CONFIG_TARGET_SAMA5D2_PTC_EK) += \
 	at91-sama5d2_ptc_ek.dtb