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This patch updates mhdp8546 firmware from v1.2.12 to v1.2.15.

Added support for performing arbitrary I2C-over-AUX transactions.
Corrected handling of erroneous requests for reading/writing 0 bytes over DPCD.
Add mailbox message to force uCPU fatal error.
Signed-off-by: Damian Kos <dkos@cadence.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>