drm/i915/perf: use the lrc_desc to get the ctx hw id in gen8-10

The upper 32 bits of the lrc_desc (bits 52-32 to be precise) are the
context hw id in GEN8-10, so use them and have one less thing to
maintain in the unlikely case we change the descriptor sw fields.

v2: If we use the lrc_desc, we must apply the ctx_id_mask too (Lionel)

Signed-off-by: Michel Thierry <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Chris Wilson <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Signed-off-by: Lionel Landwerlin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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