cnss2: Add daemon_support dts option for QCA6390

ENABLE_DAEMON_SUPPORT is by default enabled. For platforms where
cnss_daemon is not needed, number of qmi clients will be 2 and
WLAN FW will then wait for cnss_daemon to be connected and CNSS2
will timeout waiting for FW ready. Thus add a dts option to enable
daemon_support.

Change-Id: I20745a1cd6143a3f826ac6b19ddd602d21164ef2
Signed-off-by: Jia Ding <jiad@codeaurora.org>