SMU provides a way to dump the s0ix debug statistics in the form of a
metrics table via a of set special mailbox commands.

Add support to the driver which can send these commands to SMU and expose
the information received via debugfs. The information contains the s0ix
entry/exit, active time of each IP block etc.

As a side note, SMU subsystem logging is not supported on Picasso based
SoC's.
Signed-off-by: NShyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: NHans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210629084803.248498-5-Shyam-sundar.S-k@amd.comSigned-off-by: NHans de Goede <hdegoede@redhat.com>