LU-10756 ptlrpc: change IMPORT_SET_* macros into real functions

LU-10756 ptlrpc: change IMPORT_SET_* macros into real functions

Make the IMPORT_SET_STATE_NOLOCK and IMPORT_SET_STATE macros into
normal functions. Since import_set_state_nolock() is basically a
wrapper around __import_set_state() we can merge both functions.

Lustre-change: https://review.whamcloud.com/35463
Lustre-commit: cf78502e48d6dbbc0d6c113e573ba9c68c5c311e

Change-Id: Idaa6aeb81ff2282e2f83d758a267129e686bd794
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Neil Brown <neilb@suse.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/35795
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>