soc: qcom: rpmpd: Drop unused res_name from struct rpmpd

The res_name field in struct rpmpd is unused.  Drop it.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211108134442.30051-2-shawn.guo@linaro.org