WIP: lib: Add murmur3 algorithm for RAM hash

This is the murmur3 algorithm from
https://github.com/PeterScott/murmur3.

I'm not sure we can even include this since it's public domain. We might
need to use another hash algorithm. I picked it because it's supposed to
be fast.

I didn't cleanup the code at all. This is why -Wno-implicit-fallthrough
was added to the CFLAGS for a temp workaround.

BUG=b:159081993
TEST=Suspend trembyle and see hashes being generated.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I9dfd371c67966bf7a342fdb5562445e63afce664
---
M Makefile.inc
M src/Kconfig
A src/include/murmur3.h
M src/lib/Makefile.inc
A src/lib/murmur3.c
A src/lib/ram_hash_murmur.c
6 files changed, 361 insertions(+), 4 deletions(-)