[media] r820t: fix prefix of the r820t_read() function

Just cosmetic changes: all other functions are prefixed
by r820t. Do the same for r820t_read().

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>
1 file changed