Indicate support for reporting rx FCS error rate

Define macro to indicate support for fetching attributes
fcs_error_count and rx_mpdu_count in get station command.
These attributes are used to calculate rx FCS error rate.

CRs-Fixed: 2435300
Change-Id: I921726dcbb56901e1d25300229a0d21f9654b2ec
Signed-off-by: Ankita Bajaj <bankita@codeaurora.org>