drm/amd/amdgpu: introduce gc_*_mes_2.bin v2

To avoid new mes fw running with old driver, rename
mes schq fw to gc_*_mes_2.bin.

v2: add MODULE_FIRMWARE declaration
v3: squash in fixup patch

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>