i2c: npcm: Capitalize the one-line comment

Make the one-line comments capital in the driver to get the comment style
consistent.

Fixes: 56a1485b

 ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver")
Signed-off-by: Tyrone Ting <kfting@nuvoton.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>