qcacld-3.0: Fix Compilation error on WLAN_FEATURE_11W disabled

eCSR_AUTH_TYPE_RSN_8021X_SHA256 is defined only when 11W feature
is enabled. The code is using the identifier
eCSR_AUTH_TYPE_RSN_8021X_SHA256 without conditional compilation.

Access eCSR_AUTH_TYPE_RSN_8021X_SHA256 under 11W feature flag.

Change-Id: I5e1e513c12cf526045991749a487ac89d1773659
CRs-Fixed: 947938