[media] staging: lirc_serial: adjust boolean assignments

Adjusts boolean assignments from 0/1 to false/true.

And accordingly, it also adjusts the if conditions.

Signed-off-by: Heba Aamer <heba93aamer@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>