ScanResult: add clarifying comments to |flags| and |capabilities| fields

Add internal comments to the |flags| and |capabilities| fields of
ScanResult to clarify their relationship to the fields in the per-BSS
scan results from WPA supplicant.

BUG: None
Change-Id: I8685283f8cc1006ffd22f2cb2ee8f8605cc0fd2b
TEST: N/A
1 file changed