This adds the MHI SBL callback that ath11k will utilize in order to
support multiple PCI cards or AHB+PCI combo which currently does not
work due to QRTR ID-s conflicting.
This is a prerequisite for the mac80211 patch targeting ath11k as it
uses MHI from kernel.
Signed-off-by: Robert Marko <robimarko@gmail.com>
