ARM:Panda:Fix device tree loading for the panda-es

Fix the device tree loading for panda(4430) and panda-es(4460)

Modify the board name if a 4460 panda or panda-es is detected
at run time.
In the findfdt add a check for the panda-es board name and load
the panda-es device tree blob.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
diff --git a/board/ti/panda/panda.c b/board/ti/panda/panda.c
index cab0598..2bbe392 100644
--- a/board/ti/panda/panda.c
+++ b/board/ti/panda/panda.c
@@ -82,6 +82,12 @@
 	if (omap_revision() == OMAP4430_ES1_0)
 		return 0;
 
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	if (omap_revision() >= OMAP4460_ES1_0 ||
+		omap_revision() <= OMAP4460_ES1_1)
+		setenv("board_name", strcat(CONFIG_SYS_BOARD, "-es"));
+#endif
+
 	gpio_direction_input(PANDA_ULPI_PHY_TYPE_GPIO);
 	phy_type = gpio_get_value(PANDA_ULPI_PHY_TYPE_GPIO);