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igfx: fix cdclk and dpll settings for dual channel lvds on sandybridge

--- a/sys/src/cmd/aux/vga/igfx.c

+++ b/sys/src/cmd/aux/vga/igfx.c

@@ -456,7 +456,7 @@

 	case TypeSNB:

 		igfx->npipe = 2;	/* A,B */

-		igfx->cdclk = 300;	/* MHz */

+		igfx->cdclk = 400;	/* MHz */

 		goto IVBcommon;

 	case TypeIVB:

@@ -843,6 +843,10 @@

 	dpll->ctrl.v &= ~(3<<24);

 	if(port == PortLCD){

 		p2 = 14;

+		if(freq > 112*MHz){

+			p2 >>= 1;

+			dpll->ctrl.v |= (1<<24);

+		}

 		if(genpll(freq, cref, p2, &m1, &m2, &n, &p1) < 0)

 			return -1;

 	} else {