ARM: dts: aspeed: ast2600evb: Add phase correction for emmc controller.

Set MMC timing-phase register by adding the phase correction binding in the
device tree.
Signed-off-by: NSteven Lee <steven_lee@aspeedtech.com>
Acked-by: NAndrew Jeffery <andrew@aj.id.au>
Reviewed-by: NJoel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210524073308.9328-3-steven_lee@aspeedtech.comSigned-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-ast2600-evb.dts

@@ -148,7 +148,8 @@
 &emmc {
 	non-removable;
 	bus-width = <4>;
-	max-frequency = <52000000>;
+	max-frequency = <100000000>;
+	clk-phase-mmc-hs200 = <9>, <225>;
 };
 
 &rtc {