Refactor bluetooth hardware PowerUp/PowerDown functions
component/bt: fix use of a deprecated MACRO "CONFIG_ESP32_WIFI_SW_COEXIST_ENABLE"
component/bt: fix sleep wakeup in controller disable procedure
remove use of s_pm_lock_sem
1. Modified the waking up approach from async to sync: post a message to controller task upon vhci downstream packets or controller disable, and in response, controller task goes through the wake-up procedure
2. Added Controller status check for the esp_vhci APIs
3. Adjust the procedure during controller_init, check the validity of arguments first
Some minor modifications for bluetooth sleep control and configuration
1. use variable flag s_btdm_allow_light_sleep to control the use of s_light_sleep_pm_lock
2. use variable btdm_lpclk_sel to choose bluetooth sleep clock, support only for external 32kHz crystal temporarily
component/bt: improve async_wakeup function
1. check power state first and then decide if wakeup needs to be performed
2. change the meaning of the return value, if wakeup request is posted to controller task, then return true, otherwise return false
put sleep control logics in controller init/deinit/enable/disable together
Use s_lp_cntl struct: replace bool-typed variable sleep_backup_en with s_lp_cntl.mac_bb_pd
Use s_lp_cntl struct: replace bool-typed variable s_btdm_allow_light_sleep with s_lp_cntl.no_light_sleep
Use s_lp_cntl struct: replace global variable btdm_lpclk_sel with s_lp_cntl.lpclk_sel
create semaphore s_wakeup_req_sem only when low power mode is required
Use s_lp_cntl struct: use s_lp_cntl.wakeup_timer_required to control the wakeup timer
use s_lp_stat to replace original state variable sleep_backup_done and s_pm_lock_acquired
one minor change for mac_bb_pd settings init: return error status if memeory allocation failed
1. Use bt_app_gap_init function
2. Add Security Simple Pair doc
3. Update README
Update SPP demo
1. Add input module for bt_spp_initiator demo to show the security simple pair features
2. Update README of bt_spp_acceptor and bt_spp_initiator demo.
Format comment in esp_a2dp_api.h
Format comment in esp_avrc_api.h
Format comment in esp_spp_api.h
Fix bt_discovery build err
Update HFP API guide error
Remove BTA_AV_DEBUG
Remove Trailing Whitespace & End of Files
