mkelfimage: Upstream fixed packaging issue so upgrade to e1e6a91

mkelfimage: Upstream fixed packaging issue so upgrade to e1e6a91

Address QA issue: Files/directories were installed but not shipped.
New revision contains patch to mkelfimage removing
/usr/share/mkelfImage/elf32-i386 directory from Makefile install target.

http://review.coreboot.org/#/c/1195/

(From OE-Core rev: 7dd161816ccbb03db4f86902f96d3e86e09ccb64)

Signed-off-by: Raymond Danks <ray.danks@se-eng.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>