drm/i915/gvt: Extract mmio_read_from_hw() common function
The mmio read handler for ring timestmap / instdone register are same as reading hw value directly. Extract it as common function to reduce code duplications. Signed-off-by: NXiong Zhang <xiong.y.zhang@intel.com> Signed-off-by: NZhi Wang <zhi.a.wang@intel.com>
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