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/board/ti/am43xx/board.h b/board/ti/am43xx/board.h
index 091162e..017047d 100644
--- a/board/ti/am43xx/board.h
+++ b/board/ti/am43xx/board.h
@@ -47,6 +47,11 @@
 	return !strncmp(am43xx_board_name, "AM43__GP", HDR_NAME_LEN);
 }
 
+static inline int board_is_sk(void)
+{
+	return !strncmp(am43xx_board_name, "AM43__SK", HDR_NAME_LEN);
+}
+
 void enable_uart0_pin_mux(void);
 void enable_board_pin_mux(void);
 void enable_i2c0_pin_mux(void);