Add supporting datastructures for mailbox command which helps in
determining if the firmware supports appid. Allocate resources for VMID at
initialization time and clean them up on removal.

Link: https://lore.kernel.org/r/20210608043556.274139-7-muneendra.kumar@broadcom.comReviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NGaurav Srivastava <gaurav.srivastava@broadcom.com>
Signed-off-by: NJames Smart <jsmart2021@gmail.com>
Signed-off-by: NMuneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>