mfd: ab8500-core: Rename clock device and compatible

We didn't have proper device tree bindings for this clock,
I standardized it to use the exact chipname so let's rename
it "ab8500-clk" and rectify the device tree compatible string
to "stericsson,ab8500-clk".

Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/ab8500-core.c

@@ -656,8 +656,8 @@ static const struct mfd_cell ab8500_devs[] = {
 		.of_compatible = "stericsson,ab8500-regulator",
 	},
 	{
-		.name = "abx500-clk",
-		.of_compatible = "stericsson,abx500-clk",
+		.name = "ab8500-clk",
+		.of_compatible = "stericsson,ab8500-clk",
 	},
 	{
 		.name = "ab8500-gpadc",