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imx8/lcd: silly work around for display instability

running at the actual pixel clock causes the screen
to shift horizontally after a while.

using 60% seems to fix it - for now.

--- a/sys/src/9/imx8/lcd.c

+++ b/sys/src/9/imx8/lcd.c

@@ -930,8 +930,12 @@

 		goto out;

 	}

-	/* start the pixel clock */

-	setclkrate("lcdif.pix_clk", "system_pll1_clk", mode.pixclk);

+	/*

+	 * start the pixel clock. running at the actual pixel clock

+	 * causes the screen to shift horizontally after a while.

+	 * using 60% seems to fix it - for now.

+	 */

+	setclkrate("lcdif.pix_clk", "system_pll1_clk", (mode.pixclk*6)/10);

 	dpiinit(&mode);

 	/* release dpi reset */