accel/ivpu: Add debugfs interface for setting HWS priority bands

Add debugfs interface to modify following priority bands properties:
 * grace period
 * process grace period
 * process quantum

This allows for the adjustment of hardware scheduling algorithm parameters
for each existing priority band, facilitating validation and fine-tuning.

Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@intel.com>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250204084622.2422544-4-jacek.lawrynowicz@linux.intel.com