samples: logging/syst: catalog msg now support 64-bit arch

This adds to the usual qemu_x86_64 and qemu_cortex_a53 to
the entries for Sys-T catalog message in sample.yaml.
As the Sys-T backend has been updated to support 64-bit
for catalog messages.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>