hterm: wire HPA to CHA
hterm: wire HPA to CHA

Instead of duplicating the (albeit short) function, just wire the
two directly together like we do with other such functions.

Change-Id: Ifa7d63fffc63c431204aff9a502df98cecb6432a
Reviewed-on: https://chromium-review.googlesource.com/493066
Reviewed-by: Brandon Gilmore <adbfbaf7e4f927b45ce8ad3e5043a632414a833b@google.com>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

chromium/hterm,chromium/hterm,chromium/hterm,chromium/hterm