drm/xe: Add sysfs for default engine scheduler properties

drm/xe: Add sysfs for default engine scheduler properties

For each HW engine under GT we are adding defaults sysfs
entry to list all engine scheduler properties and its
default values. So that it will be easier for user to
fetch default values of these properties anytime to go
back to default.

For example,
DUT# cat /sys/class/drm/card1/device/tileN/gtN/engines/bcs/.defaults/
job_timeout_ms         preempt_timeout_us     timeslice_duration_us

where,
@job_timeout_ms: The time after which a job is removed from the scheduler.
@preempt_timeout_us: How long to wait (in microseconds) for a preemption
                     event to occur when submitting a new context.
@timeslice_duration_us: Each context is scheduled for execution for the
                        timeslice duration, before switching to the next
                        context.

V12:
   - Add missing drmm_add_action_or_reset and remove sysfs files
V11:
   - Rebase
V10:
   - Remove xe_gt.h inclusion from .h - Matt
V9 :
   - Remove jiffies for job_timeout_ms - Matt
V8 :
   - replace xe_engine with xe_hw_engine - Matt
V7 :
   - Push all errors to one error path at every places - Niranjana
   - Describe struct member to resolve kernel doc err - CI hooks
V6 :
   - Use engine class interface instead of hw engine
     in sysfs for better interfacing readability - Niranjana
V5 :
   - Scheduling props should apply per class engine not per hardware engine - Matt
   - Do not record value of job_timeout_ms if changed based on dma_fence - Matt
V4 :
   - Resolve merge conflicts - CI
V3 :
   - Rearrange code in its own file
   - Rebase
   - Update commit message to reflect tile addition
V2 :
   - Use sysfs_create_files in this patch - Niranjana
   - Handle prototype error for xe_add_engine_defaults - CI hooks
   - Remove unused member sysfs_hwe - Niranjana

Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>