fbdev: bfin_adv7393fb: Drop needless include

Kernel drivers don't need <linux/i2c-dev.h>.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>