Revert "libhealthloop: Handle netlink receive buffer overflows"

Revert this CL because there are several signs that too much time
is spent in healthd and because CL "libhealthloop: Handle netlink
receive buffer overflows" is suspected of causing an infinite loop.

Bug: 359559224
Change-Id: Iaec132da47284d662b357b901b81b21fb6d7cd9e
Signed-off-by: Bart Van Assche <bvanassche@google.com>