LU-14778 readahead: fix to reserve min pages

LU-14778 readahead: fix to reserve min pages

@pages_min might be larger than @pages which indicate
more pages should be read, and it will cause a warning
later.

Lustre-change: https://review.whamcloud.com/44050
Lustre-commit: 4fc127428f00d6a3b179a143a61ddc78e5d8ca7c

Signed-off-by: Wang Shilong <wshilong@ddn.com>
Change-Id: Ifd82f709c3877172f08b87ab0551da735a0613e0
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-on: https://review.whamcloud.com/44287
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>