ARM: dts: imx28: reparent gpmi clock to ref_gpmi

Since ref_gpmi is sourced from pll0 (480MHz), It allows the GPMI
controller to manage High-Speed NAND Timing (edo mode 3,4 and 5).
Co-developed-by: NMichael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: NMichael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: NDario Binacchi <dario.binacchi@amarulasolutions.com>
Tested-by: NSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx28.dtsi

@@ -110,6 +110,8 @@
 				interrupt-names = "bch";
 				clocks = <&clks 50>;
 				clock-names = "gpmi_io";
+				assigned-clocks = <&clks 13>;
+				assigned-clock-parents = <&clks 10>;
 				dmas = <&dma_apbh 4>;
 				dma-names = "rx-tx";
 				status = "disabled";