bus: mhi: core: Improve debug messages for power up

Improve error message to be more descriptive if a failure occurs
with an invalid power up execution environment. Additionally, add
a debug log to print the execution environment and MHI state
before a power up is attempted to confirm if the device is in an
expected state. This helps clarify reasons for power up failures
such as the device being found in a PBL or Emergency Download
Mode execution environment and the host expected a full power up
with Pass-Through and no image loading involved.

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hemant Kumar <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Bhaumik Bhatt <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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