media: cec: remove cec-edid.c

Move cec_get_edid_phys_addr() to cec-adap.c. It's not worth keeping
a separate source for this.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v4.17 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>