TLV targets advertises the agile Spectral capability in the
chain mask table of extended service ready event.
For legacy targets, mac phy capabilities, which holds the
chain mask table is null. This leads to a load time crash
for some legacy platforms. To fix this, initialize
agile Spectral as disabled for the targets which doesn't
support extended service ready message.
CRs-Fixed: 2854348
Change-Id: I09a64259b31e3e5eb0441f35dbb9451dec001780
6ed59fa1e3