drm/radeon: fix quirk for MSI R7 370 Armor 2X

There was a typo in the original.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=92865



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