LU-14008 o2iblnd: avoid memory copy for short msg

LU-14008 o2iblnd: avoid memory copy for short msg

Modern cards allow to send a kernel memory data without mapping
or copy to the preallocated buffer.
It reduce a lnet selftest cpu consumption by 3% for messages
less than 4k size.

Test-Parameters: trivial
HPe-bug-id: LUS-1796
Change-Id: I96c31be680c8ea7ac289a755df7f1d4c1c7f9aef
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Reviewed-on: https://review.whamcloud.com/40262
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>