drm/i915: pnv dpll doesn't use m1!

So don't try to store it in the DPLL_FP register.

Otherwise it looks like the limits for pineview are correct: It has
it's own clock computation code, which doesn't use an offset for n
divisors, and the register value based m limits look sane enough.

v2: Rebase on top of the pineview clock refactor and fixup up the
commit message: It's m1 pnv doens't care about, not m2!

Quoting Damien's review:

  - "n can vary between 2 and 6, but we declare the 3-6 as limits.
  - "p1 seems to be able to go up to 9
  - "the m upper limit seems a bit big, but the docs are a bit shy on
    that values for pnv.

"Otherwise, the change itself seems good:"
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -4240,7 +4240,7 @@ static int i9xx_get_refclk(struct drm_crtc *crtc, int num_connectors)
 
 static uint32_t pnv_dpll_compute_fp(struct dpll *dpll)
 {
-	return (1 << dpll->n) << 16 | dpll->m1 << 8 | dpll->m2;
+	return (1 << dpll->n) << 16 | dpll->m2;
 }
 
 static uint32_t i9xx_dpll_compute_fp(struct dpll *dpll)