drm/xe: Consolidate debugfs fault injection functions

The fault injection code was scattered: the GT reset
hook lived in xe_gt.h as an inline function with its own global
variable, the CSC hook had a separate global in xe_hw_error.c with
an extern declaration, and each was individually registered in
xe_debugfs.c. Adding a new error type meant editing many files and
copy-pasting the same boilerplate.

Debugfs interface (under /sys/kernel/debug/dri/0/):
 - fail_gt_reset         - GT reset failure
 - inject_csc_hw_error   - CSC firmware error

Signed-off-by: Mallesh Koujalagi <mallesh.koujalagi@intel.com>
Reviewed-by: Riana Tauro <riana.tauro@intel.com>
Link: https://patch.msgid.link/20260715085159.424040-2-mallesh.koujalagi@intel.com
Signed-off-by: Riana Tauro <riana.tauro@intel.com>

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