mfd: ab8500-core: Add abx500-clk as an mfd child device

Hierarchically, the abx500-clk shall be considered as a child of the
ab8500 core. The abx500-clk is intiated at arch init and thus the clks
will be available when clients needs them.

Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab8500-core.c

@@ -951,6 +951,10 @@ static struct mfd_cell __devinitdata abx500_common_devs[] = {
 		.name = "ab8500-regulator",
 		.of_compatible = "stericsson,ab8500-regulator",
 	},
+	{
+		.name = "abx500-clk",
+		.of_compatible = "stericsson,abx500-clk",
+	},
 	{
 		.name = "ab8500-gpadc",
 		.of_compatible = "stericsson,ab8500-gpadc",