[media] hdpvr-video: Use the proper check for I2C support

As reported by Geert Uytterhoeven <geert@linux-m68k.org>:
	drivers/media/usb/hdpvr/hdpvr-video.c: warning: "CONFIG_I2C_MODULE" is not defined [-Wundef]

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Thanks-to: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>