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igfx: set the display/overlay/cursor plane override disbale bits for G45 (like bios)

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

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

@@ -1004,6 +1004,10 @@

 	csr(igfx, p->cur->cntr.a, 1<<5 | 7, 0);

 	csr(igfx, p->cur->base.a, ~0, 0);	/* arm */

+	/* display/overlay/cursor planes off */

+	if(igfx->type == TypeG45)

+		csr(igfx, p->conf.a, 0, 3<<18);

+

 	/* disable cpu pipe */

 	disabletrans(igfx, p);

-- 

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