platform/x86/intel/tpmi: Add debugfs interface

mainline inclusion
from mainline-v6.6-rc1
commit b326c1bb
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8WOEC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b326c1bbb146b9bae38cf53243c6d272aaa1c7e3



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

Add debugfs interface for debugging TPMI configuration and register
contents. This shows PFS (PM Feature structure) for each TPMI device.

For each feature, show full register contents and allow to modify
register at an offset.

This debugfs interface is not present on locked down kernel with no
DEVMEM access and without CAP_SYS_RAWIO permission.

Intel-SIG: commit b326c1bb platform/x86/intel/tpmi: Add debugfs interface.
Backport Intel_tpmi base driver.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230712225950.171326-3-srinivas.pandruvada@linux.intel.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[ Yingbao Jia: amend commit log ]
Signed-off-by: Yingbao Jia <yingbao.jia@intel.com>