net/qede/base: support mapped doorbell BARs for VF

net/qede/base: support mapped doorbell BARs for VF

Determines whether VF utilizes doorbells via limited register bar or via
the doorbell bar and return the size of the HW doorbell bar via acquire
response. By doing that limit the VF CIDs to an amount that would make sure
doorbells for all CIDs fall within the bar.

Signed-off-by: Rasesh Mody <rasesh.mody@cavium.com>