MIPS: BCM63XX: use a switch for external irq config
MIPS: BCM63XX: use a switch for external irq config

Makes the code a bit more readable and easier to add support for
new chips.

Signed-off-by: Maxime Bizon <f76ce1f46e3863a1d2d6b7e849385982e002f716@freebox.fr>
Signed-off-by: Jonas Gorski <9712c064bde5a52658fc87d6454b4956f9bf286b@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/4093/
Signed-off-by: John Crispin <be6487f9df4dce44a640672d6c07330104d43593@openwrt.org>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs