[media] cx88: reorder inline to prevent a gcc warning

drivers/media/pci/cx88/cx88.h:97:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88.h:103:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:649:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:654:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:659:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:664:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:684:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]
drivers/media/pci/cx88/cx88-core.c:695:1: warning: 'inline' is not at beginning of declaration [-Wold-style-declaration]

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>