linux-firmware: Update firmware for Cadence MHDP8546 DP bridge

Update firmware for Cadence MHDP8546 DP bridge to version 2.0.0.
The firmware source code now complies with MISRA2012 and HIS
rules and directives. Also, there are some improvements in AUX
channel communication handling.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>