irqchip: bcm283x: Switch to SPDX identifier

Adopt the SPDX license identifier headers to ease license compliance
management.

Cc: Simon Arlott <simon@arlott.org>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>