acx-mac80211: fix build on kernel 4.9

The DEFINE_PCI_DEVICE_TABLE macro was removed with upstream commit
7e9321599011 ("treewide: remove references to the now unnecessary
DEFINE_PCI_DEVICE_TABLE").

Use the pci_device_id struct to fix the acx-mac80211 build failure on
ramips.

Signed-off-by: Mathias Kresin <dev@kresin.me>

package/kernel/acx-mac80211/patches/100-compat.patch

@@ -0,0 +1,16 @@
+diff --git a/pci.c b/pci.c
+index ae07f5a..72d542f 100644
+--- a/pci.c
++++ b/pci.c
+@@ -1495,7 +1495,11 @@ static struct acxpci_device_info acxpci_info_tbl[] __devinitdata = {
+ #endif
+ 
+ #ifdef CONFIG_PCI
++#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
+ static DEFINE_PCI_DEVICE_TABLE(acxpci_id_tbl) = {
++#else
++static const struct pci_device_id acxpci_id_tbl[] = {
++#endif
+ 	{ PCI_VDEVICE(TI, PCI_DEVICE_ID_TI_TNETW1100A),
+ 	  .driver_data = CHIPTYPE_ACX100,
+ 	},