qcacld-3.0: Add 320MHz case to conversion function
If the 11BE feature is enabled, 320MHz is added to the channel width
enum. This causes a compilation error in switch cases that do not handle
this case. Add the 320 case to the switch statement.
Change-Id: I6cf4f1395f9f8eb2fc14029dc371742362befa80
CRs-fixed: 2961456