x86,fs/resctrl: Rename struct rdt_mon_domain and rdt_hw_mon_domain

x86,fs/resctrl: Rename struct rdt_mon_domain and rdt_hw_mon_domain

The upcoming telemetry event monitoring is not tied to the L3 resource and
will have a new domain structure.

Rename the L3 resource specific domain data structures to include "l3_"
in their names to avoid confusion between the different resource specific
domain structures:
rdt_mon_domain		-> rdt_l3_mon_domain
rdt_hw_mon_domain	-> rdt_hw_l3_mon_domain

No functional change.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com