board: ti: am43xx: add support for AM43xx Industrial Development Kit

AM43xx Industrial Development Kit is a new board
based on AM437x line of SoCs. Targetted at Industrial
Automation applications, it comes with EtherCAT, motor
control and other goodies.

Thanks to James Doublesin for all the help.

Cc: James Doublesin <doublesin@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/board/ti/am43xx/board.h b/board/ti/am43xx/board.h
index 8e12191..eb9493e 100644
--- a/board/ti/am43xx/board.h
+++ b/board/ti/am43xx/board.h
@@ -53,6 +53,11 @@
 	return !strncmp(am43xx_board_name, "AM43__SK", HDR_NAME_LEN);
 }
 
+static inline int board_is_idk(void)
+{
+	return !strncmp(am43xx_board_name, "AM43_IDK", HDR_NAME_LEN);
+}
+
 static inline int board_is_evm_14_or_later(void)
 {
 	return (board_is_gpevm() && strncmp("1.4", am43xx_board_rev, 3) <= 0);