[source] uboot-at91: Add support for SAMA5D4 Xplained board

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/5b9cff921ebe54cecba38c17b3c60babb73f1f1a

commit 5b9cff921ebe54cecba38c17b3c60babb73f1f1a
Author: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
AuthorDate: Wed Sep 13 11:51:22 2017 -0700

    uboot-at91: Add support for SAMA5D4 Xplained board
    
    Add support for SAMA5D4 Xplained board and options to select & build
    u-boot configs for different media storage.
    
    Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
---
 package/boot/uboot-at91/Makefile | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/package/boot/uboot-at91/Makefile b/package/boot/uboot-at91/Makefile
index e2d3ed0..8dc5e3e 100644
--- a/package/boot/uboot-at91/Makefile
+++ b/package/boot/uboot-at91/Makefile
@@ -54,14 +54,34 @@ define uboot/sama5d2_xplained_mmc
   BUILD_DEVICES:=at91-sama5d2_xplained
 endef
 
+define uboot/sama5d4_xplained_spiflash
+  TITLE:=U-Boot for the SAMA5D4 Xplained board (SPI Flash)
+  BUILD_SUBTARGET:=sama5
+  BUILD_DEVICES:=at91-sama5d4_xplained
+endef
+
+define uboot/sama5d4_xplained_mmc
+  TITLE:=U-Boot for the SAMA5D4 Xplained board (SDcard)
+  BUILD_SUBTARGET:=sama5
+  BUILD_DEVICES:=at91-sama5d4_xplained
+endef
+
+define uboot/sama5d4_xplained_nandflash
+  TITLE:=U-Boot for the SAMA5D4 Xplained board (NandFlash)
+  BUILD_SUBTARGET:=sama5
+  BUILD_DEVICES:=at91-sama5d4_xplained
+endef
+
 UBOOT_TARGETS := \
 	at91sam9m10g45ek_nandflash \
 	at91sam9x5ek_nandflash \
     sama5d3_xplained_nandflash \
     sama5d3_xplained_mmc \
     sama5d2_xplained_mmc \
-    sama5d2_xplained_spiflash
-
+    sama5d2_xplained_spiflash \
+    sama5d4_xplained_mmc \
+    sama5d4_xplained_spiflash \
+    sama5d4_xplained_nandflash
 
 define Build/Compile
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \