drm/radeon: add quirk for ASUS R7 370

[ Upstream commit 2b02ec79004388a8c65e227bc289ed891b5ac8c6 ]

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=92260



Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>