cnss2: Add check to avoid unbalanced power set

Driver may enter CLOSED state after loaded and idle for a certain time,
power is turned off in such case, then if unload happen, power would be
turned off again, which will cause unbalance.

Add power_up state in cnss_plat_data to avoid unbalanced power set.

Change-Id: I640d98650e32b53632cc2712af1cbae8ac280a68
Signed-off-by: Frank Liu <qiliu@codeaurora.org>