Removed unused or unnecessary defines

Removed the following defines because they are unused or unnecessary:
 - AVDT_REPORTING
 - AVRC_METADATA_INCLUDED
 - BTA_INCLUDED
 - SBC_FOR_EMBEDDED_LINUX
 - BTA_AVRCP_FF_RW_SUPPORT
 - GATT_DB_BUF_SIZE
 - BTM_DEFAULT_SCO_MODE
 - BTM_BLE_ADV_TX_POWER
 - BTM_BLE_ADV_TX_POWER_*
 - ATT_INCLUDED
 - ATT_DEBUG
 - GAP_TRANSPORT_SUPPORTED
 - GATTP_TRANSPORT_SUPPORTED
 - PORT_CREDIT_RX_MAX
 - PORT_CREDIT_RX_LOW
 - AVDT_INCLUDED
 - AVDT_REPORTING
 - HID_DEV_SUBCLASS
 - A2D_INCLUDED

Also:
 - Changed tBTA_AV_SCB field p_cap from dynamically allocated to
   inlined storage, and renamed it to peer_cap.
 - Removed unused typedef tBTM_BLE_ADV_TX_POWER

Test: Manual: streaming to Headset.
Change-Id: I0db18cc7ae3b9e692c71b430436f3170e8e4d65e