input: misc: fix sysfs permissions

input: misc: fix sysfs permissions

- Fix sysfs permissions.
- Fix raw accelerometer access.
- Fix autodetection behind MPU.
- Add self-test.

Bug 1224709
Bug 1243584
Bug 1291044
Bug 1295651
Bug 1290313
Bug 1298831

Change-Id: I55847fd158abdb9f12dc830218619c6ed7913396
Signed-off-by: Erik Lilliebjerg <elilliebjerg@nvidia.com>
Reviewed-on: http://git-master/r/237428
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Xiaohui Tao <xtao@nvidia.com>
Tested-by: Xiaohui Tao <xtao@nvidia.com>
Reviewed-by: Matt Wagner <mwagner@nvidia.com>