For MCL side, WLAN_UMAC_MAX_PDEVS is always 1 from current design,
so it's wrong to use WLAN_UMAC_MAX_PDEVS define array dcs_pdev_priv,
since dcs_pdev_priv includes firmware indicated pdev dcs information,
define WLAN_DCS_MAX_PDEVS to 3 for dcs use, this will be compatible
for both MCL and WIN side.
Change-Id: I3bac35f561c49e9959645e85774662ff48d7903d
CRs-Fixed: 2627683