grub2.inc: run autogen.sh before configure

grub2.inc: run autogen.sh before configure

* When adding new source files from upstream the autogen.sh
  script needs to be run
* Rework grub2-remove-sparc64-setup-from-x86-builds.patch
  to remove the grub-setup helper program grub-sparc64-setup
  in Makefile.util.def instead of the previous Makefile.util.am
  to avoid the update for Makefile.util.am in do_patch phase is
  overwritten by the autogen.sh in do_configure phase

Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>