twl6030: move twl6030 register access functions to common header file

twl6030_i2c_[read|write]_u8 can be used else where to access
multi-function device such as twl6030, so move the register access
functions to the common twl6030.h header file.

Signed-off-by: Nishanth Menon <nm@ti.com>
2 files changed