[media] cx231xx: fix compiler warnings

[media] cx231xx: fix compiler warnings

If CONFIG_VIDEO_CX231XX_RC is undefined, then these compiler warnings
are generated:

In file included from drivers/media/usb/cx231xx/cx231xx-cards.c:23:0:
drivers/media/usb/cx231xx/cx231xx-cards.c: In function ‘cx231xx_release_resources’:
drivers/media/usb/cx231xx/cx231xx.h:982:30: warning: statement with no effect [-Wunused-value]
 #define cx231xx_ir_exit(dev) (0)
                              ^
drivers/media/usb/cx231xx/cx231xx-cards.c:1158:2: note: in expansion of macro ‘cx231xx_ir_exit’
  cx231xx_ir_exit(dev);
  ^
drivers/media/usb/cx231xx/cx231xx-cards.c: In function ‘cx231xx_init_dev’:
drivers/media/usb/cx231xx/cx231xx.h:981:30: warning: statement with no effect [-Wunused-value]
 #define cx231xx_ir_init(dev) (0)
                              ^
drivers/media/usb/cx231xx/cx231xx-cards.c:1351:2: note: in expansion of macro ‘cx231xx_ir_init’
  cx231xx_ir_init(dev);
  ^
drivers/media/usb/cx231xx/cx231xx-cards.c: In function ‘cx231xx_usb_probe’:
drivers/media/usb/cx231xx/cx231xx.h:982:30: warning: statement with no effect [-Wunused-value]
 #define cx231xx_ir_exit(dev) (0)
                              ^
drivers/media/usb/cx231xx/cx231xx-cards.c:1705:2: note: in expansion of macro ‘cx231xx_ir_exit’
  cx231xx_ir_exit(dev);
  ^
drivers/media/usb/cx231xx/cx231xx-cards.c: In function ‘cx231xx_usb_disconnect’:
drivers/media/usb/cx231xx/cx231xx.h:982:30: warning: statement with no effect [-Wunused-value]
 #define cx231xx_ir_exit(dev) (0)
                              ^
drivers/media/usb/cx231xx/cx231xx-cards.c:1754:3: note: in expansion of macro ‘cx231xx_ir_exit’
   cx231xx_ir_exit(dev);
   ^

Fix by using static inlines instead of defines.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>