product/juno: Deny CLOCK_CONFIG_SET to the OSPM agent for CPU clocks

Some clocks, like the ones related to CPUs, must not be actionable from
the OSPM agent; while CLOCK_RATE_SET is already inhibited for such clocks,
the same check is missing for CLOCK_CONFIG_SET.

Update the resource permission mask accordingly.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>