bus: mhi: Make firmware image optional for controller
Some controllers can opt to not have MHI download a firmware image to have the device bootup and can find the device in a pass through execution environment, ready to go. Thus, MHI controllers for those devices do not need fw_image defined. Make it optional to accommodate different bootup modes. Suggested-by: NLoic Poulain <loic.poulain@linaro.org> Signed-off-by: NBhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: NJeffrey Hugo <jhugo@codeaurora.org> Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/1615315595-37750-1-git-send-email-bbhatt@codeaurora.orgSigned-off-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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