drm/i915: Define MCR registers explicitly

Rather than using the same _MMIO() macro to define MCR registers as
singleton registers, let's use a new MCR_REG() macro to make it clear
that these registers are special and should be handled accordingly.  For
now MCR_REG() will still generate an i915_reg_t with the given offset,
but we'll change that in future patches.

Bspec: 66673, 66696, 66534, 67609
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Balasubramani Vivekanandan <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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