wlcore/wl18xx/wl12xx: use u8 instead of bool for host_fast_wakeup_support

The conf structure is going to be exported to a file, so we should use
only well defined types.  bool is not well defined and may vary from
platform to platform, so change the host_fast_wakeup_support type to
u8 instead.

Signed-off-by: Luciano Coelho <coelho@ti.com>