radeon: Remove useless quirk for zx1/FireGL X1 combo introduced with fdo #7770
radeon: Remove useless quirk for zx1/FireGL X1 combo introduced with fdo #7770

Removes useless quirk a7f465f73363fce409870f62173d518b1bc02ae6 introduced with
fdo #7770 as a failed attempt to minimize stability issues with hp zx1 chipset/
ATI FireGL X1 graphics adapter configuration
(see http://marc.info/?l=linux-ia64&m=140077543819871&w=2 for details/reason)

Signed-off-by: Émeric MASCHINO <19df7cdf3debe071dbea488bac70134d508507ac@gmail.com>
Signed-off-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs