osd/OSDMap: maybe_remove_pg_upmaps - s/pg_to_raw_up/pg_to_raw_upmap/

osd/OSDMap: maybe_remove_pg_upmaps - s/pg_to_raw_up/pg_to_raw_upmap/

The upmap results are directly applied after calling
_pg_to_raw_osds, which means it basically has nothing to do
with the up/down status.
In other words, if a pg_upmap/pg_upmap_items remapped a pg
into some down osds and is now causing collided result,
we should still be able to detect and cancel that.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
(cherry picked from commit d9ed406a61c46858dd8350af5c72d7b8824dcdd3)

Conflicts:
	s/nextmap/tmpmap/