LU-14073 ptlrpc: remove debugging assert using segment_eq()

LU-14073 ptlrpc: remove debugging assert using segment_eq()

In Linux 5.9-rc1 commit 428e2976a5, segment_eq() is removed as it was
only used in uaccess_kernel(). But uaccess_kernel() was introduced in Linux
v4.12-rc1, which does not cover all supported kernel versions.

As segment_eq() is only used in 1 actual debugging call, avoid adding a
new configuration test for uaccess_kernel() and just remove the 2
related LASSERTs.

Test-Parameters: trivial
Signed-off-by: Aurelien Degremont <degremoa@amazon.com>
Change-Id: I1595e9b085176d2106a2b958e1fd6f4031cc2f69
Reviewed-on: https://review.whamcloud.com/40797
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Neil Brown <neilb@suse.de>