drm/panfrost: Do the exception -> string translation using a table

Do the exception -> string translation using a table. This way we get
rid of those magic numbers and can easily add new fields if we need
to attach extra information to exception types.

v4:
* Don't expose exception type to userspace
* Merge the enum definition and the enum -> string table declaration
  in the same patch

v3:
* Drop the error field

Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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