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imx8/lcd: reduce flicker

increasing the pixel clock to 80% of the edid clock value
reduces flicker and also seems to not trigger the shifting
issue.

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

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

@@ -933,9 +933,9 @@

 	/*

 	 * 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.

+	 * using 80% seems to fix it - for now.

 	 */

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

+	setclkrate("lcdif.pix_clk", "system_pll1_clk", (mode.pixclk*8)/10);

 	dpiinit(&mode);

 	/* release dpi reset */