bus: mhi: host: Add a new API for getting channel doorbell offset

Some controllers may want to access a specific doorbell register. Hence add
a new API that reads the CHDBOFF register and returns the offset of the
doorbell registers from MMIO base, so that the controller can calculate the
address of the specific doorbell register by adding the register offset
with doorbell offset and MMIO base address.

Signed-off-by: Qiang Yu <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[mani: reworded commit message and Kdoc]
Signed-off-by: Manivannan Sadhasivam <[email protected]>

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