board: ls1043a: enable dhcp boot

dhcp boot is a useful feature and works out-of-the-box on these
platforms. Enable it as a boot source.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
diff --git a/include/configs/ls1043a_common.h b/include/configs/ls1043a_common.h
index 662b573..73b048b 100644
--- a/include/configs/ls1043a_common.h
+++ b/include/configs/ls1043a_common.h
@@ -238,7 +238,8 @@
 #ifndef CONFIG_SPL_BUILD
 #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>
 #endif