platform/x86: amd-pmc: Add support for AMD Smart Trace Buffer

STB (Smart Trace Buffer), is a debug trace buffer that isolates the
failures by analyzing the last running feature of a system. This
non-intrusive way always runs in the background and stores the trace
into the SoC.

This patch enables the STB feature by passing module param
"enable_stb=1" while loading the driver and provides mechanism to
access the STB buffer using the read and write routines.

Co-developed-by: Shyam Sundar S K <[email protected]>
Signed-off-by: Shyam Sundar S K <[email protected]>
Signed-off-by: Sanket Goswami <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>

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