drm/i915/selftests: Downgrade severity of CS/SRM frequency scaling tests

Gracefully skip over the failures in the frequency scaling for the
moment, the results are under review.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/1754Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: "Sundaresan, Sujaritha" <sujaritha.sundaresan@intel.com>
Cc: "Ewins, Jon" <jon.ewins@intel.com>
Reviewed-by: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200723153805.8076-1-chris@chris-wilson.co.ukSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/gt/selftest_rps.c

@@ -700,7 +700,7 @@ int live_rps_frequency_cs(void *arg)
 				f = act; /* may skip ahead [pcu granularity] */
 			}
 
-			err = -EINVAL;
+			err = -EINTR; /* ignore error, continue on with test */
 		}
 
 err_vma:
@@ -841,7 +841,7 @@ int live_rps_frequency_srm(void *arg)
 				f = act; /* may skip ahead [pcu granularity] */
 			}
 
-			err = -EINVAL;
+			err = -EINTR; /* ignore error, continue on with test */
 		}
 
 err_vma: