Checks hidl service and remove hidl call at dump

Two things:
  * check for hidl service availability before calling any hidl
    functions.
  * remove hidl dependency on dump to ensure dump will not cause
    crash due to hidl failure.

Bug: 36073404
Test: check sensor running after reboot
Test: check dumpsys sensorservice works normally.
Change-Id: I8626635a143a9f07f263f85d95ab16749ea1e452