misc: keba: Use capital letters for I2C error message

Print "I2C" instead of "i2c" in error message as "I2C" is the official
name for the bus.

Signed-off-by: Gerhard Engleder <eg@keba.com>
Link: https://lore.kernel.org/r/20241011191257.19702-3-gerhard@engleder-embedded.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>