PD#163673: BT: introduce power_down_disable property in DT
introduce a power_down_disable property in the DT file, we need to
keep power on for the ap62x8 in order to pass the vts test
Change-Id: I1984ded1e7f96732630b4e94a97bbb2705a8fbd6
Signed-off-by: Kuibao Zhang <kuibao.zhang@amlogic.com>