mfd: Rename 88pm8607 to 88pm860x in mfd

Rename 88PM8607 to 88PM860X in both Makefile and Kconfig under mfd directory.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 834b484..dbfe31a 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -191,7 +191,7 @@
 
 config REGULATOR_88PM8607
 	bool "Marvell 88PM8607 Power regulators"
-	depends on MFD_88PM8607=y
+	depends on MFD_88PM860X=y
 	help
 	  This driver supports 88PM8607 voltage regulator chips.