platform/x86/amd/hsmp: add support for metrics tbl

platform/x86/amd/hsmp: add support for metrics tbl

AMD MI300 MCM provides GET_METRICS_TABLE message to retrieve
all the system management information from SMU.

The metrics table is made available as hexadecimal sysfs binary file
under per socket sysfs directory created at
/sys/devices/platform/amd_hsmp/socket%d/metrics_bin

Metrics table definitions will be documented as part of Public PPR.
The same is defined in the amd_hsmp.h header.

Signed-off-by: Suma Hegde <suma.hegde@amd.com>
Reviewed-by: Naveen Krishna Chatradhi <nchatrad@amd.com>
Link: https://lore.kernel.org/r/20231010120310.3464066-2-suma.hegde@amd.com
[ij: lseek -> lseek(), dram -> DRAM in dev_err()]
[ij: added period to terminate a documentation sentence]
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>