V4L/DVB (5383): Fix duplicated codes in Pinnacle Grey remote

The keymap for this remote had duplicated labels for different keys,
which resulted in those key pairs being unable to function as different
inputs.

Signed-off-by: Emil Georgiev <emilonlinester@gmail.com>
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>