u-boot-fw-utils: be sure to patch just 2016.03 version

If u-boot is provided in a meta-bsp, it is not sure
that it must be patched. Split the append recipes,
letting the wildcard just install the libubootenv library.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Philip Balister <philip@balister.org>
Acked-by: Philip Balister <philip@balister.org>

recipes-bsp/u-boot/u-boot-fw-utils_2016.03.bbappend

@@ -0,0 +1,6 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+
+SRC_URI_append = "\
+    file://0001-tools-env-bug-config-structs-must-be-defined-in-tool.patch \
+    file://0001-tools-env-fix-config-file-loading-in-env-library.patch \
+    "