u-boot: mkimage: Drop recipe

The upstream recipe is suitable.  Drop to reduce our maintainence
burden.

Tested: Built image and verified mkimage 2016.03
Change-Id: I20456e6430254334aaf014e58e8dccd20469321c
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/common/recipes-bsp/u-boot/u-boot-mkimage_2016.07.bb b/meta-phosphor/common/recipes-bsp/u-boot/u-boot-mkimage_2016.07.bb
deleted file mode 100644
index 7f40435..0000000
--- a/meta-phosphor/common/recipes-bsp/u-boot/u-boot-mkimage_2016.07.bb
+++ /dev/null
@@ -1,24 +0,0 @@
-SUMMARY = "U-Boot bootloader image creation tool"
-LICENSE = "GPLv2+"
-SECTION = "bootloader"
-
-DEPENDS = "openssl"
-
-require u-boot.inc
-
-S = "${WORKDIR}/git"
-
-EXTRA_OEMAKE = 'CROSS_COMPILE="${TARGET_PREFIX}" CC="${CC} ${CFLAGS} ${LDFLAGS}" STRIP=true V=1'
-
-do_compile () {
-	oe_runmake sandbox_defconfig
-	oe_runmake cross_tools NO_SDL=1
-}
-
-do_install () {
-	install -d ${D}${bindir}
-	install -m 0755 tools/mkimage ${D}${bindir}/uboot-mkimage
-	ln -sf uboot-mkimage ${D}${bindir}/mkimage
-}
-
-BBCLASSEXTEND = "native nativesdk"