Remove init function from ContextHubService

Now that we are planning a soft reset instead of a hard reset when the underlying
AIDL HAL dies, we do not need to have an explicit init() function.

Bug: 246384988
Test: adb logcat | grep -iE 'contexthub|CHRE' # normal
Test: adb shell dumpsys contexthub # normal
Change-Id: I23e5a0a467688243db9083b56fc51b96fd6364df
1 file changed