qcacmn: Add HIF changes to support qca6490

HIF changes to support qca6490 WLAN chipset.

Change-Id: I4b1be1770a2daf0a0db6f65f579831e3fcb10e79
CRs-Fixed: 2522133

hif/inc/hostdef.h

@@ -35,6 +35,7 @@ extern struct hostdef_s *QCA9984_HOSTdef;
 extern struct hostdef_s *QCA9888_HOSTdef;
 extern struct hostdef_s *QCA6290_HOSTdef;
 extern struct hostdef_s *QCA6390_HOSTdef;
+extern struct hostdef_s *QCA6490_HOSTdef;
 #ifdef ATH_AHB
 extern struct hostdef_s *IPQ4019_HOSTdef;
 #endif