The jpeg_v5_3_0_process_interrupt function is identical to
jpeg_v5_0_0_process_interrupt. Remove the duplicate implementation
in jpeg_v5_3_0 and assign the jpeg_v5_0_0 version directly to the irq_funcs struct.
Export jpeg_v5_0_0_process_interrupt through jpeg_v5_0_0.h to allow
cross-version reuse.