[ARM] pxa: rename GCU IRQ for consistency
[ARM] pxa: rename GCU IRQ for consistency

For consistency reasons, rename IRQ_GRPHICS to IRQ_GCU.

Signed-off-by: Daniel Mack <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@caiaq.de>
Signed-off-by: Eric Miao <60e376623d7bcedd53f4c51cbb2c060fb40a4887@gmail.com>

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