When the Green AP feature is disabled in the Kbuild the following
build issue is observed:
target_if_green_ap.h:59:10: error: 'struct wlan_green_ap_egap_params'
declared inside parameter list [-Werror]
target_if_green_ap.h:59:10: error: its scope is only this definition
or declaration, which is probably not what you want [-Werror]
Fix this by including a forward reference for the struct.
Change-Id: Ia5d867c0ebde17dba0f20c1e97391197ae9dbb77
CRs-Fixed: 2216249
Remove dependency on WMA layer for green AP component by registering
green AP events through target_if layer.
Change-Id: I8fe9079c6ba6b23cd5f1d98a7d1b333fde31f19b
CRs-Fixed: 2178143
