LU-13814 osc: do not call osc_lru_use for transient

LU-13814 osc: do not call osc_lru_use for transient

Transient pages are never added to the LRU, because they
can't be cached.  osc_lru_use already skips them because
they don't have the flag set, but make it explicit that
this is not called for transient pages.

Test-Parameters: trivial
Signed-off-by: Patrick Farrell <patrick.farrell@oracle.com>
Change-Id: I2c92ccb52380faefbcba3bfa35508dac2b601bd4
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52087
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>