wifi: Add firmware mode controller

This module will make the necessary calls to reconfigure the
driver/firmware in the required state.
The module assumes that the sysfs paths needed to be accessed has been
chowned to "wifi" at bootup in the device's .rc file.

Bug: 32018162
Test: Compiles
Change-Id: I827c5eb6b5b4a3810e912d4164dbc8ff0ef4d30c