pinctrl: intel: Convert to use SPDX identifier

Reduce size of duplicated comments by switching to use SPDX identifier.

No functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/intel/Kconfig

@@ -1,6 +1,6 @@
-#
+# SPDX-License-Identifier: GPL-2.0
 # Intel pin control drivers
-#
+
 if (X86 || COMPILE_TEST)
 
 config PINCTRL_BAYTRAIL