LU-7623 lnet: Remove __user attribute from lnet_copy_flat2* functions

LU-7623 lnet: Remove __user attribute from lnet_copy_flat2* functions

These functions do not take a user pointer, so __user attribute was a mistake

This was introduced by http://review.whamcloud.com/11819,
commit 4ea13c63f3d919282b12c64d0c014bfe9a67a5e6

Change-Id: I97c1a9b17e3146f9f5f37ac92f7769cfdcf085cb
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/17785
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>