drm/xe/xe_late_bind_fw: Introduce debug fs node to disable late binding

Introduce a debug filesystem node to disable late binding fw reload
during the system or runtime resume. This is intended for situations
where the late binding fw needs to be loaded from user mode,
perticularly for validation purpose.
Note that xe kmd doesn't participate in late binding flow from user
space. Binary loaded from the userspace will be lost upon entering to
D3 cold hence user space app need to handle this situation.

v2:
  - s/(uval == 1) ? true : false/!!uval/ (Daniele)
v3:
  - Refine the commit message (Daniele)

Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20250905154953.3974335-9-badal.nilawar@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

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