samsung: exynos: Convert SROMC interface to a driver

Add a bus driver for this and use it to configure the bus parameters for
the Ethernet interface. Drop the old pre-driver-model code.

Switch over to use driver model for Ethernet.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/exynos5250-smdk5250.dts b/arch/arm/dts/exynos5250-smdk5250.dts
index e542a79..afe0cca 100644
--- a/arch/arm/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/dts/exynos5250-smdk5250.dts
@@ -41,6 +41,7 @@
 	};
 
 	sromc@12250000 {
+		compatible = "samsung,exynos5-sromc";
 		bank = <1>;
 		srom-timing = <1 9 12 1 6 1 1>;
 		width = <2>;