PlatformPropeties: Add properties for start/stop supplicant

These are used by the wifi stack to manualy start/stop the supplicant
daemon on devices running older versions of HAL. Since wifi is going to
become a mainline module, it cannot use
"SystemProperties.set("ctl.start", "supplicant")"

Bug: 144695435
Test: Compiles
Change-Id: I1a10f087cb0d2a8028ec2aea1e69b0c458fcf8bf
2 files changed
tree: 34f63312cdd0996190dd55fb1649e84ba4dbe76b
  1. srcs/
  2. OWNERS