Allow for reading of information like manufacturer, product number
and serial number from the FRU chip. Report the serial number as
the new sysfs file serial_number. Note that this only works on
server cards, as consumer cards do not feature the FRU chip, which
contains this information.

v2: Add documentation to amdgpu.rst, add helper functions,
    rename functions for consistency, fix bad starting offset
v3: Remove testing definitions
Signed-off-by: NKent Russell <kent.russell@amd.com>
Reviewed-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>