drm/amdgpu: add vram reservation based on vram_usagebyfirmware_v2_2

drm/amdgpu: add vram reservation based on vram_usagebyfirmware_v2_2

commit 4864f2ee9ee2acf4a1009b58fbc62f17fa086d4e upstream

Move TMR region from top of FB to 2MB for FFBM, so we need to
reserve TMR region firstly to make sure TMR can be allocated at 2MB

Signed-off-by: Tong Liu01 <Tong.Liu01@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>