bus: mhi: host: allow MHI client drivers to provide the firmware via a pointer

Currently MHI loads the firmware image from the path provided by client
devices. ath11k needs to support firmware image embedded along with meta
data (named as firmware-2.bin). So allow the client driver to request the
firmware file from user space on it's own and provide the firmware image
data and size to MHI via a pointer struct mhi_controller::fw_data.

This is an optional feature, if fw_data is NULL MHI load the firmware using
the name from struct mhi_controller::fw_image string as before.

Tested with ath11k and WCN6855 hw2.0.

Signed-off-by: Kalle Valo <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[mani: wrapped commit message to 75 columns]
Signed-off-by: Manivannan Sadhasivam <[email protected]>

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