ARM: s3c24xx: Fix invalid SPDX identifier

GPL-1.0 is not part of the valid identifier list and as its meaning is GPL
version 1.0 only this would be incompatible with the kernel license.

As this code was included into the kernel, assume its GPL-1.0+

Fixes: 84b21701 ("ARM: S3C24XX: Add SPDX license identifiers")
Cc: Arnaud Patard <arnaud.patard@rtp-net.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>