Append the shortened git revision to the u-boot version
Append the shortened git revision to the u-boot version

This add the first 7 characters of the git sha-1 to the compiled in
u-boot version.

With  this change the serial console displays the following version information:

U-Boot 2014.04-gee425f9 (Oct 01 2014 - 22:20:35) Allwinner Technology

Without the version looks like this:

U-Boot 2014.04 (Oct 01 2014 - 21:55:57) Allwinner Technology


Signed-off-by: Christian Ege <a8fc705480847268478fb419154fd82cc75b19e4@gmail.com>

rofehr/meta-sunxi,net147/meta-sunxi,linux-sunxi/meta-sunxi,ebutera/meta-sunxi,rofehr/meta-sunxi,geomatsi/meta-sunxi,jlucius/meta-sunxi,net147/meta-sunxi,linux-sunxi/meta-sunxi,twoerner/meta-sunxi,O-Computers/meta-sunxi,rofehr/meta-sunxi,soderstrom-rikard/meta-sunxi,linux-sunxi/meta-sunxi,jlucius/meta-sunxi,jlucius/meta-sunxi,O-Computers/meta-sunxi,soderstrom-rikard/meta-sunxi,O-Computers/meta-sunxi,ebutera/meta-sunxi,geomatsi/meta-sunxi,twoerner/meta-sunxi