PM / devfreq: passive: revert an editing accident in SPDX-License line

Commit 26984d9d581e ("PM / devfreq: passive: Keep cpufreq_policy for
possible cpus") reworked governor_passive.c, and accidently added a
tab in the first line, i.e., the SPDX-License-Identifier line.

The checkpatch script warns with the SPDX_LICENSE_TAG warning, and hence
pointed this issue out while investigating checkpatch warnings.

Revert this editing accident. No functional change.

Signed-off-by: Lukas Bulwahn <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/devfreq/governor_passive.c

···
-	// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/drivers/devfreq/governor_passive.c
  *