powercap: intel_rapl_tpmi: Fix bogus register reading

The TPMI_RAPL_REG_DOMAIN_INFO value needs to be multiplied by 8 to get
the register offset.

Cc: All applicable <stable@vger.kernel.org>
Fixes: 903eb9fb ("powercap: intel_rapl_tpmi: Fix System Domain probing")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Link: https://patch.msgid.link/20240930081801.28502-2-rui.zhang@intel.com


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