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/video/omap/lcd_2430sdp.c b/drivers/video/omap/lcd_2430sdp.c
index 3764a36..e3eccc9 100644
--- a/drivers/video/omap/lcd_2430sdp.c
+++ b/drivers/video/omap/lcd_2430sdp.c
@@ -52,7 +52,7 @@
 #define TWL4030_VPLL2_DEV_GRP           0x33
 #define TWL4030_VPLL2_DEDICATED         0x36
 
-#define t2_out(c, r, v) twl4030_i2c_write_u8(c, r, v)
+#define t2_out(c, r, v) twl_i2c_write_u8(c, r, v)
 
 
 static int sdp2430_panel_init(struct lcd_panel *panel,