i2c: xiic: Change code alignment to 1 space only

Alignment removed and replaced with 1 space only to
reduce need for future alignment changes affecting multiple
lines, when new variables are added.

Signed-off-by: Jaakko Laine <ext-jaakko.laine@vaisala.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>