Remove u-boot-fw-utils from IMAGE_INSTALL

Install u-boot-fw-utils via dependency, rather than explicitly
attempting to include it in all images.

Tested: Built witherspoon, qemux86 images
Change-Id: I371cb4b848d67d75816a6d0d3b35bc7615f2ec39
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
index 648eb93..c402904 100644
--- a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
+++ b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
@@ -14,7 +14,6 @@
         'obmc-ubi-fs', \
         'mtd-ubi mtd-ubi-tar', \
         'mtd-static mtd-static-tar mtd-static-alltar', d)}"
-OBMC_IMAGE_EXTRA_INSTALL_append = " u-boot-fw-utils"
 
 INITRAMFS_CTYPE ?= "lzma"
 INITRAMFS_FSTYPES += "cpio.${INITRAMFS_CTYPE}"