MIPS: Alchemy: pb1200: update CPLD cascade irq handler.
MIPS: Alchemy: pb1200: update CPLD cascade irq handler.

Tested on Db1200.

Signed-off-by: Manuel Lauss <abf1aa4a5e1ac3fe9069b2a7add8400e4e267223@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <92f48d309cda194c8eda36aa8f9ae28c488fa208@linux-mips.org>

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