i2c: wmt: rename something

1. The I2C IP for both wmt and zhaoxin originates from VIA. Rename
   common registers, functions, and variable names to follow the
   VIAI2C_ and viai2c_ naming conventions for consistency and clarity.
2. rename i2c_dev to i2c, to shorten the length of a line.
3. rename wait_result to time_left, make it better to reflect the meaning
   of the value returned by wait_for_completion_timeout().
4. remove TCR_MASTER_WRITE, its value is 0.

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Hans Hu <hanshu-oc@zhaoxin.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>