ARM11: use now-generic memory utils

ARM11: use now-generic memory utils

Now the ARM11 cores can use the renamed arm_checksum_memory()
and arm_blank_check_memory() routines ... do so.

Sanity checked with "flash erase_check" of both NOR banks on an
OMAP2420 ... the algorithm code dumped four lines of of "poll"
status after each of almost 520 blocks (yes, *very* annoying) but
gave plausible results after producing that spam.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>