doc: Remove unneeded Ubuntu dependencies for GRUB
doc: Remove unneeded Ubuntu dependencies for GRUB

I built GRUB on Ubuntu v.15.10, and I found that some of the
dependencies listed in the Galileo documentation do not actually need
to be listed on the apt-get install command line.  Some are simply
unnecessary, and others are already listed as dependencies by other
packages in the list.

Change-Id: If6ae0c3abe54a18839e75299a3e9cf006c745d0c
Signed-off-by: Michael LeMay <a7ec037f586d05d1db8b7a2fba042303d2aeceb3@intel.com>

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