input:misc:add AKM ecompass linux driver

The change to add linux drivers support for akm0991,akm8963 and akm8975.

Change-Id: I0ecfac506f2c0c4724af1f0514f1a9cb47334004
Signed-off-by: xingxiao <xwings.nexus@gmail.com>
Git-commit: 694fa07b8274c8ab8d6cb4b8935567f4964c0089
Git-repo: https://github.com/x-xwings/AKM_Kernel.git


[mengmeng@codeaurora.org: cherry-picked from mirrored branch]
Signed-off-by: Oliver Wang <mengmeng@codeaurora.org>