wl12xx: mcp2.5 - add config_ps acx

mcp2.5 uses this acx to configure the fw only once, rather than
passing the params in every enter psm command.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>