drm/i915/guc: Fix missing ecodes

Error captures are tagged with an 'ecode'. This is a pseduo-unique magic
number that is meant to distinguish similar seeming bugs with
different underlying signatures. It is a combination of two ring state
registers. Unfortunately, the register state being used is only valid
in execlist mode. In GuC mode, the register state exists in a separate
list of arbitrary register address/value pairs rather than the named
entry structure. So, search through that list to find the two exciting
registers and copy them over to the structure's named members.

v2: if else if instead of if if (Alan)

Signed-off-by: John Harrison <[email protected]>
Reviewed-by: Alan Previn <[email protected]>
Fixes: a6f0f9cf330a ("drm/i915/guc: Plumb GuC-capture into gpu_coredump")
Cc: Alan Previn <[email protected]>
Cc: Umesh Nerlige Ramappa <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Aravind Iddamsetty <[email protected]>
Cc: Michael Cheng <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Bruce Chang <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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