Revert "Add timeout and panic when __scm_call_armv8_64 takes too long."

This reverts commit 5f318d40.

Reason for revert: the fix for b/74358862 was merged and this debug code is no longer needed.
Bug:79777538

Change-Id: Iec5a91ba174c379d90bd504ecb9b48b6c06c40ff
Signed-off-by: Siyuan Zhou <siyuanzhou@google.com>