Remove unnecessary lock on mHalReady/mHalWrapper for dumpInternal

Reading thermal hal values should not lock the global mLock which may
hang the service for other APIs calls that don't need to connect HAL.

Bug: 408690758
Test: adb dumpsys thermalservice
Flag: EXEMPT bugfix
Change-Id: I4762983181588fb18f4d7f87582f0d52a6ec3648