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setup_vmem() already calls populate for all online memory regions.
pgtable_populate_end() could be removed.

Also rename pgtable_populate_begin() to pgtable_populate_init().
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>