htohd: update libhoth includes

libhoth has been refactored and exposing header files into transports
and protocol namespace.

change in hothd accordingly.

Tested:
build success

Google-Bug-Id: 413710117
Change-Id: I86b4b1701640840de9aac0ad218f05007a0cbbaf
Signed-off-by: Dan Zhang <zhdaniel@google.com>
2 files changed