i2c: Fix whitespace style issue

This patch fixes a coding style issue in the alignment of parameters
in the function i2c_smbus_write_bytes(). It replaces spaces with tabs for
alignment,  as per the coding style guidelines.

Signed-off-by: Liam Zuiderhoek <zuiderhoekl@gmail.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>