power: make most tps drivers and the twl4030 driver compatible with DM_I2C

Those driver are not DM drivers per se (not using the PMIC/regulator
framework) and are using the legacy I2C API. Make them compatible with
the DM_I2C API.

This impacts the following drivers:
- palmas (used by am57xx/dra7xx evms)
- tps65218 (used by am43xx evms)
- tps65217 and tps65910 (used by am335x evms and am335x boneblack vboot)
- twl4030 (used by omap3_logicpd)
- tps65217 (used by brppt1)
- twl6030

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/include/twl4030.h b/include/twl4030.h
index 46a9306..c27ad61 100644
--- a/include/twl4030.h
+++ b/include/twl4030.h
@@ -648,6 +648,7 @@
  *   examples are TWL4030_PM_RECEIVER_VMMC1_DEV_GRP and
  *   TWL4030_LED_LEDEN.
  */
+#ifndef CONFIG_DM_I2C
 static inline int twl4030_i2c_write_u8(u8 chip_no, u8 reg, u8 val)
 {
 	return i2c_write(chip_no, reg, 1, &val, 1);
@@ -657,7 +658,10 @@
 {
 	return i2c_read(chip_no, reg, 1, val, 1);
 }
-
+#else
+int twl4030_i2c_write_u8(u8 chip_no, u8 reg, u8 val);
+int twl4030_i2c_read_u8(u8 chip_no, u8 reg, u8 *val);
+#endif
 /*
  * Power
  */