Switch ZSWAP_ZPOOL to zsmalloc

The z3fold compressed pages allocator is on it's way
out of the Linux kernel and running this on newer
systems will give you an error:

+ lib/host:configure_zswap:45              :   echo z3fold
z3fold
tee: /sys/module/zswap/parameters/zpool: No such file or directory

So, get ahead of things and move to the much faster
recommended by the kernel developers alternative.

[1]: https://lore.kernel.org/all/20240904233343.933462-1-yosryahmed@google.com/T/#u

Change-Id: I7c137114dd7585d3179a8d5dee818bb379bbcb1f
diff --git a/lib/host b/lib/host
index a812c39..58062ef 100644
--- a/lib/host
+++ b/lib/host
@@ -35,7 +35,7 @@
 # lz4 is very fast although it does not have the best compression
 # zstd has much better compression but more latency
 ZSWAP_COMPRESSOR=${ZSWAP_COMPRESSOR:="lz4"}
-ZSWAP_ZPOOL=${ZSWAP_ZPOOL:="z3fold"}
+ZSWAP_ZPOOL=${ZSWAP_ZPOOL:="zsmalloc"}
 function configure_zswap {
     if [[ $ENABLE_ZSWAP == "True" ]] ; then
         # Centos 9 stream seems to only support enabling but not run time