HID: Free process_repage_timer to prevent leak

Usecase:
1) Perform BT on/off stress test
2) Check for memory leakage in code in subsequent BT on/off usecase

Expectation
No memory leak during BT on/off stress test

Observed result
Memory leakage in hid code where alarm process_repage_timer is not freed
and only cancelled

Fix:
Free alarm process_repage_timer during HID Host deregstration

Test: Checked with BT on/off usecase, and alarm process_repage_timer is now
freed in every BT on/off usecase.

Bug: 65657207
Change-Id: Iccecd126716a5660f4c37ddc917bacee84342297