The BIOS on MSI Mortar B550m WiFi (MS-7C94) board with AMDGPU seems
disabling the other pins than HDMI although it has more outputs
including DP.

This patch adds the board to the allow list for enabling all pins.
Reported-by: Damjan Georgievski <gdamjan@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/CAEk1YH4Jd0a8vfZxORVu7qg+Zsc-K+pR187ezNq8QhJBPW4gpw@mail.gmail.com
Link: https://lore.kernel.org/r/20210716135600.24176-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>