metric-config: remove the buffer/cache-memory threshold

The kernel will naturally attempt to use almost all free memory up with
buffers and caches.  We should not have a threshold on this behavior
by default.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic40a260667e89d62820e99753efda025ba5bde47
2 files changed