hal: avoid set power mode during call if FM is active

If FM is not stopped during VoLTE in island mode,
the island port would access the loopback non-island
client to cause crash.

Fix it by avoid set power mode during call if FM is
active.

Change-Id: I2ceab67e1a67cec6cbd2d10a05dc3d83be6dec7b
1 file changed