platform/x86/amd: pmc: differentiate STB/SMU messaging prints

Modify the dynamic debug print to differentiate between the regular
and spill to DRAM usage of the SMU message port.

Suggested-by: Sanket Goswami <Sanket.Goswami@amd.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20230206150855.1938810-4-Shyam-sundar.S-k@amd.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>