drm/xe/guc_pc: Retry and wait longer for GuC PC start

drm/xe/guc_pc: Retry and wait longer for GuC PC start

In a rare situation of thermal limit during resume, GuC can
be slow and run into delays like this:

xe 0000:00:02.0: [drm] GT1: excessive init time: 667ms! \
   		 [status = 0x8002F034, timeouts = 0]
xe 0000:00:02.0: [drm] GT1: excessive init time: \
   		 [freq = 100MHz (req = 800MHz), before = 100MHz, \
   		 perf_limit_reasons = 0x1C001000]
xe 0000:00:02.0: [drm] *ERROR* GT1: GuC PC Start failed
------------[ cut here ]------------
xe 0000:00:02.0: [drm] GT1: Failed to start GuC PC: -EIO

When this happens, it will block entirely the GPU to be used.
So, let's try and with a huge timeout in the hope it comes back.

Also, let's collect some information on how long it is usually
taking on situations like this, so perhaps the time can be tuned
later.

Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250307160307.1093391-1-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>