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CP-54473 Configure max-cstate by XAPI (#6681)

C-states are power management states for CPUs where higher numbered
states represent deeper sleep modes with lower power consumption but
higher wake-up latency. The max_cstate parameter controls the deepest
C-state that CPUs are allowed to enter.

Common C-state values:
- C0: CPU is active (not a sleep state)
- C1: CPU is halted but can wake up almost instantly
- C2: CPU caches are flushed, slightly longer wake-up time
- C3+: Deeper sleep states with progressively longer wake-up times

To set max_cstate on dom0 host, two commands are used: `xenpm` to set at
runtime and `xen-cmdline` to set it in grub conf file to take effect
after reboot.
xenpm examples:
```
   # xenpm set-max-cstate 0 0
   max C-state set to C0
   max C-substate set to 0 succeeded
   # xenpm set-max-cstate 0
   max C-state set to C0
   max C-substate set to unlimited succeeded
   # xenpm set-max-cstate unlimited
   max C-state set to unlimited
   # xenpm set-max-cstate -1
   Missing, excess, or invalid argument(s)
```
xen-command-line examples:
```
/opt/xensource/libexec/xen-cmdline --get-xen max_cstate
     "" -> unlimited
     "max_cstate=N" -> max cstate N
     "max_cstate=N,M" -> max cstate N, max c-sub-state M *)
/opt/xensource/libexec/xen-cmdline --set-xen max_cstate=1
/opt/xensource/libexec/xen-cmdline --set-xen max_cstate=1,0
/opt/xensource/libexec/xen-cmdline --delete-xen max_cstate
```

[xen-command-line.max_cstate](https://xenbits.xen.org/docs/unstable/misc/xen-command-line.html#max_cstate-x86).

This PR adds a new field `host.max_cstate` to manage host's max_cstate.
`host.set_max_cstate` use the two commands mentioned above to configure.
While dbsync on xapi start, the filed will be synced by `xen-cmdline
--get-xen max_cstate`

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