drm/amd/display: Allow backlight to go below AMDGPU_DM_DEFAULT_MIN_BACKLIGHT
The issue with panel power savings compatibility below
`AMDGPU_DM_DEFAULT_MIN_BACKLIGHT` happens at
`AMDGPU_DM_DEFAULT_MIN_BACKLIGHT` as well.

That issue will be fixed separately, so don't prevent the backlight
brightness from going that low.

Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Thomas Weißschuh <li...@weissschuh.net>
Link: 
https://lore.kernel.org/amd-gfx/be04226a-a9e3-4a45-a83b-6d263c655...@t-8ch.de/T/#m400dee4e2fc61fe9470334d20a7c8c89c9aef44f
Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>

** Patch added: 
"drm-amd-display-allow-backlight-to-go-below-amdgpu-dm-default-min-backlight.patch"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2095291/+attachment/5853038/+files/drm-amd-display-allow-backlight-to-go-below-amdgpu-dm-default-min-backlight.patch

** Bug watch added: gitlab.freedesktop.org/drm/amd/-/issues #3020
   https://gitlab.freedesktop.org/drm/amd/-/issues/3020

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https://bugs.launchpad.net/bugs/2095291

Title:
  kernel Patch to Fix Low and Inverted Brightness Value on AMD Devices

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