EX-7601 osc: remove cpga fill bits

EX-7601 osc: remove cpga fill bits

cpga fill bits are not needed now that we don't support
compression and encryption.

Test-Parameters: trivial
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: I13c2278e085e9b288bd896585947e28e2ea505ca
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53082
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>