powercap/intel_rapl_msr: Convert rapl_msr_priv into pointer

mainline inclusion
from mainline-5.16-rc6
commit a2c32fa7
category: feature
feature: milan cpu
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NX57


CVE: NA

--------------------------------

Changes the static struct rapl_msr_priv to a pointer to allow using
a different RAPL MSR interface, preparing for supporting AMD's RAPL
MSR interface.

No functional changes.

Signed-off-by: Victor Ding <victording@google.com>
Acked-by: Kim Phillips <kim.phillips@amd.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: qinyu <qinyu16@huawei.com>
Reviewed-by: Chao Liu <liuchao173@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Chao Liu <liuchao173@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>