turnip: enable has_ccu_flush_bug workaround for a660
It seems that a660 has the same bug. Without the workaround there are a lot of flakes with depth-stencil tests, e.g. in:
dEQP-VK.pipeline.extended_dynamic_state.*
dEQP-VK.renderpass.depth_stencil_write_conditions.*
dEQP-VK.pipeline.stencil.format.d24_unorm_s8_uint.states.*
Or guaranteed failures like of:
dEQP-VK.pipeline.render_to_image.core.2d.huge.width.r8g8b8a8_unorm_d32_sfloat_s8_uint
Enabling the workaround fixes all of them.
cc: mesa-stable