grub: remove diffutils and freetype runtime dependencies
The diffutils runtime dependency was introduced from legacy grub since
the script grub-install invokes cmp command which is from diffutils
package. But in Grub2 the grub-install has been rewritten with C
language. So this package isn't needed anymore.
The freetype runtime dependency is for grub-mkfont but we have
explicitly disabled grub-mkfont build. It is safe to remove it.
Signed-off-by: Yi Zhao <yi.zhao@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
