Currently, driver state control param write only support WiFi On/Off.
There is no provision for user space to know that whether the driver
recovery is complete or not.
To address this, add support for WAIT_FOR_READY string in the state
control param write. Whenever WAIT_FOR_READY string is written to
the state control param, driver should wait for ongoing recovery
to complete and then return.
Change-Id: If97c44497f1bbe69683b7483c179f9dc14fa75f1
CRs-Fixed: 3141194
08c076908b