at91: remove SAMA5D3 from Default image build.

As the Default profile option is a legacy subtarget, the dtb for the
sama5d3_xplained board DTS is not built and image generation fails.

Signed-off-by: Ben Whitten <ben.whitten@gmail.com>

SVN-Revision: 48351

target/linux/at91/image/Makefile

@@ -76,7 +76,6 @@ define Image/Build/Kernel/Default
 	$(call Image/Build/Kernel/AT91SAM9M10G45EK)
 	$(call Image/Build/Kernel/AT91SAM9X25EK)
 	$(call Image/Build/Kernel/AT91SAM9X35EK)
-	$(call Image/Build/Kernel/AT91SAMA5D3XPLAINED)
 	$(call Image/Build/Kernel/LMU5000)
 	$(call Image/Build/Kernel/TNYA9260)
 	$(call Image/Build/Kernel/TNYA9263)