mfd: Rename all twl4030_i2c*

This patch renames function names like twl4030_i2c_write_u8,
twl4030_i2c_read_u8 to twl_i2c_write_u8, twl_i2c_read_u8
and also common variable in twl-core.c

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
index c8a6e58..8cc46e9 100644
--- a/drivers/regulator/twl-regulator.c
+++ b/drivers/regulator/twl-regulator.c
@@ -64,7 +64,7 @@
 	u8 value;
 	int status;
 
-	status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
+	status = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
 			&value, info->base + offset);
 	return (status < 0) ? status : value;
 }
@@ -72,7 +72,7 @@
 static inline int
 twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
 {
-	return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
+	return twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
 			value, info->base + offset);
 }
 
@@ -171,12 +171,12 @@
 	if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
 		return -EACCES;
 
-	status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
+	status = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 			message >> 8, 0x15 /* PB_WORD_MSB */ );
 	if (status >= 0)
 		return status;
 
-	return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
+	return twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 			message, 0x16 /* PB_WORD_LSB */ );
 }