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.
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Philippe LANGLAIS <philippe.langlais@stericsson.com>
Reviewed-by: Patrice CHOTARD <patrice.chotard@stericsson.com>
Reviewed-by: Gabriel FERNANDEZ <gabriel.fernandez@stericsson.com>
Reviewed-by: Philippe BEGNIC <philippe.begnic@stericsson.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab8500-core.c

@@ -1188,6 +1188,10 @@ static struct mfd_cell ab9540_devs[] = {
 	{
 		.name = "ab8500-regulator",
 	},
+	{
+		.name = "abx500-clk",
+		.of_compatible = "stericsson,abx500-clk",
+	},
 	{
 		.name = "ab8500-gpadc",
 		.of_compatible = "stericsson,ab8500-gpadc",
@@ -1255,6 +1259,10 @@ static struct mfd_cell ab8505_devs[] = {
 	{
 		.name = "ab8500-regulator",
 	},
+	{
+		.name = "abx500-clk",
+		.of_compatible = "stericsson,abx500-clk",
+	},
 	{
 		.name = "ab8500-gpadc",
 		.num_resources = ARRAY_SIZE(ab8505_gpadc_resources),
@@ -1314,6 +1322,10 @@ static struct mfd_cell ab8540_devs[] = {
 	{
 		.name = "ab8500-regulator",
 	},
+	{
+		.name = "abx500-clk",
+		.of_compatible = "stericsson,abx500-clk",
+	},
 	{
 		.name = "ab8500-gpadc",
 		.num_resources = ARRAY_SIZE(ab8505_gpadc_resources),