thermal: intel: int340x: soc_slider: Set offset only for balanced mode

thermal: intel: int340x: soc_slider: Set offset only for balanced mode

The slider offset can be set via debugfs for balanced mode. The offset
should be only applicable in balanced mode. For other modes, it should
be 0 when writing to MMIO offset,

Fixes: 8306bcaba06d ("thermal: intel: int340x: Add module parameter to change slider offset")
Tested-by: Erin Park <erin.park@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: 6.18+ <stable@vger.kernel.org> # 6.18+
[ rjw: Subject and changelog tweaks ]
Link: https://patch.msgid.link/20260324172346.3317145-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>