board: Enable DHCP distro boot for LS1012a, LS1021a

Enable DHCP distro boot for Layerscape LS1012A and LS1021A.
Signed-off-by: NYunfeng Ding <yunfeng.ding@nxp.com>
Signed-off-by: NPrabhakar Kushwaha <prabhakar.kushwaha@nxp.com>

include/configs/ls1012a_common.h

@@ -95,9 +95,10 @@
 
 #ifndef CONFIG_SPL_BUILD
 #define BOOT_TARGET_DEVICES(func) \
-	func(SCSI, scsi, 0) \
 	func(MMC, mmc, 0) \
-	func(USB, usb, 0)
+	func(USB, usb, 0) \
+	func(SCSI, scsi, 0) \
+	func(DHCP, dhcp, na)
 #include <config_distro_bootcmd.h>
 #endif
 

include/configs/ls1021atwr.h

@@ -315,7 +315,8 @@
 
 #define BOOT_TARGET_DEVICES(func) \
 	func(MMC, mmc, 0) \
-	func(USB, usb, 0)
+	func(USB, usb, 0) \
+	func(DHCP, dhcp, na)
 #include <config_distro_bootcmd.h>
 
 #ifdef CONFIG_LPUART