V4L/DVB (12365): ir-kbd-i2c: Remove superfulous inlines

Functions which are referenced by their address can't be inlined by
definition.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>