LU-6142 obd: remove OBP and MDP macros

LU-6142 obd: remove OBP and MDP macros

These macros save very little space, make it harder
to understand the code (by adding one more thing to
remember) and make it impossible to grep for
o_* and m_* functions. Luckily, they are only used in
a few places. So, remove them and all references.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I4c23199ca53c906ca190a81ffdf916ff6cff9a0b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51739
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>