HintManagerService: Generate dummy mSupportInfo for non power AIDL devices

* Before it would generate dummy info when the IPower AIDL version
  was too old. Now we will generate it when IPower is just completely
  unavailable as well, avoiding a crash from accessing an
  uninitialized mSupportInfo.

test: sailfish boot :D
Change-Id: Ibf43d0bfea9fd6cdeae35248e4dde58c01d3ef3b
Signed-off-by: electimon <electimon@gmail.com>