meta-ibm: Add a chrony configuration file

The huygens machine is based on the new pstbmc machine family from IBM.
It will be our first redundant BMC system [1]. This new system expects
to have chrony daemon to run along with the existing systemd-
timesyncd deamon.

The commit adds a custom chrony configuration file in order to
achieve syncing of time between redundant BMCs.

[1]: https://gerrit.openbmc.org/c/openbmc/docs/+/70233



Tested: Configuration file is updated.

Change-Id: I6fb6787055bdfc423ef439c43b9c17db679d062f
Signed-off-by: Pavithra Barithaya <pavithrabarithaya07@gmail.com>