Revert "Update health 2.1 readme for file_contexts"

This reverts commit ca44707aea99626476980529a18d7607c8aefddd.

Reason for revert: charger uses hwbinder health HAL now

Bug: 142674987
Test: none

Change-Id: I2be2d393331ad3c377e0b144cfe0c92d3ab59689
1 file changed