Revert "Floss: Add dbus method to enable devcoredump"

This reverts commit b34a984d.

Reason for revert: Feature flag dependency cleanup.

Bug: 384024562
Tag: #floss
Test: m com.android.btservices, Verify coredump works by writing to sysfs
Change-Id: I06fd19f4836b18040778808b500216eba644c75a