thermal: intel: int340x: Add missing DVFS support flags

DVFS (Dynamic Voltage Frequency Scaling) is still supported for DDR
memory on Lunar Lake and Panther Lake.

Add the missing flag PROC_THERMAL_FEATURE_DVFS.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20250410172943.577913-1-srinivas.pandruvada@linux.intel.com


[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>