wlan_hdd_state_ctrl_param_create() creates a control file that is
used to synchronize the wlan driver with the Wi-Fi HAL in
userspace.
Currently the driver creates the file at the path /dev/<module>.
The WIFI_DRIVER_STATE_CTRL_PARAM configuration item defines the path
that the Wi-Fi HAL uses, and this is /dev/wlan.
So when the driver is built with a module name of "wlan" the file is
created at the expected path. However when the driver is built with a
different name, as is done when TARGET_MULTI_WLAN is enabled, the file
is not created at the expected path.
Therefore change the driver to always create the file at the path
specified in the WIFI_DRIVER_STATE_CTRL_PARAM configuration item.
In addition do not even enable the functionality if the
WIFI_DRIVER_STATE_CTRL_PARAM configuration item is not set
(i.e. on non-Android platforms).
Change-Id: I8a7f0a9b22e3f49d02f896150bd452f80af9c022
CRs-Fixed: 2905381
216957b430