Making all ivc channel driver as subsys level init, so that
drivers are registered when ivc bus is created and ivc channel
devices are added. Which will make sure that ready call is made
to all ivc channel drivers for them to know when RTCPU is online
or offline.

Also adding ready func ops to all ivc channel drivers and test if
it was called by is_ready flag.

CRTC-925

Change-Id: I0d91624fe3dc23cb894d59cba0a7bdcb4626d2ac
Signed-off-by: Ashish Singh <assingh@nvidia.com>
Reviewed-on: http://git-master/r/1326220
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jihoon Bang <jbang@nvidia.com>

Tests fail from time to time because of excessive logging.

Bug 1699448

Change-Id: I36030553ac5eb22ecb15cab266557b8f5b60de8f
Signed-off-by: Pekka Pessi <ppessi@nvidia.com>
Reviewed-on: http://git-master/r/1190977
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Remi Denis-Courmont <remid@nvidia.com>
Reviewed-by: Sudhir Vyas <svyas@nvidia.com>

Signed-off-by: Remi Denis-Courmont <remid@nvidia.com>
Change-Id: Ib994dddebf63facf84c476656aacf3b1abe61f1c
Reviewed-on: http://git-master/r/1156560
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jan Solanti <jsolanti@nvidia.com>
Reviewed-by: Pekka Pessi <ppessi@nvidia.com>
Reviewed-by: Mika Liljeberg <mliljeberg@nvidia.com>

This converts the sysfs-mbox driver to an IVC channel driver.
Also, driver unbinding is fixed.

JIRA CRTC-150

Signed-off-by: Remi Denis-Courmont <remid@nvidia.com>
Change-Id: I62c7cb5b3289d3c19c867b47b138e8ad6abe6480
Reviewed-on: http://git-master/r/1140593
Reviewed-by: Mika Liljeberg <mliljeberg@nvidia.com>