drm/radeon: add quirk for MSI R7 370

[ Upstream commit e78654799135a788a941bacad3452fbd7083e518 ]

Just adds the quirk for MSI R7 370 Armor 2X
Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=91294



Signed-off-by: Maxim Sheviakov <mrader3940@yandex.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>