qcacld-3.0: Enable QCA6390

1. Enable emulation flags for QCA6390 bring up.
2. Select QCA6390 header files based on
   CONFIG_QCA6390_11AX flag.
3. Compile API's based on QCA_WIFI_QCA6390 flag.

Change-Id: I6330c734587ef772b25e722762e194eadd043d28
CRs-Fixed: 2259314
6 files changed