git: add Git perl module to perltools package

git: add Git perl module to perltools package

Git perl tools such as add--interactive load the Git module at runtime.
A previous patch to eliminate a QA error by deleting it instead of
packaging it was incorrect.

    beaglebone[62]$ git add -i
    Can't locate Git.pm in @INC (you may need to install the Git module) (@INC contains: /usr/lib/perl/5.20.0 /prj/pab/Utils/lib/perl5/linux-arm/5.020000 /prj/pab/Utils/lib/perl5/ /prj/pab/Utils/lib/perl5/site_perl/linux-arm /prj/pab/Utils/lib/perl5/site_perl /etc/perl /usr/lib/perl/site_perl/5.20.0/ /usr/lib/perl/site_perl/5.20.0 /usr/lib/perl/vendor_perl/5.20.0/ /usr/lib/perl/vendor_perl/5.20.0 /usr/lib/perl/5.20.0/ /usr/local/lib/site_perl .) at /usr/lib/git/git-core/git-add--interactive line 7.
    BEGIN failed--compilation aborted at /usr/lib/git/git-core/git-add--interactive line 7.

[YOCTO#3780]

(From OE-Core rev: 804f8e650f433d00907ec04282c22aaff2e5c044)

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>