board: ti: am43xx: add support for AM43xx Starter Kit

AM43xx Starter Kit is a new board based on
AM437x line of SoCs. Being a low-cost EVM and
small size EVM are intended to provide an entry
level development platform on a full fledged
Hardware System.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index 823cba6..974ce98 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -226,6 +226,8 @@
 			"setenv fdtfile am43x-epos-evm.dtb; fi; " \
 		"if test $board_name = AM43__GP; then " \
 			"setenv fdtfile am437x-gp-evm.dtb; fi; " \
+		"if test $board_name = AM43__SK; then " \
+			"setenv fdtfile am437x-sk-evm.dtb; fi; " \
 		"if test $fdtfile = undefined; then " \
 			"echo WARNING: Could not determine device tree; fi; \0"