i2c: busses: i2c-ali1563: File headers are not good candidates for kernel-doc

Fixes the following W=1 kernel build warning(s):

 drivers/i2c/busses/i2c-ali1563.c:24: warning: expecting prototype for i2c(). Prototype was for ALI1563_MAX_TIMEOUT() instead

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>