bfin: fix decoding of cacheflush syscall
bfin: fix decoding of cacheflush syscall

* cacheflush.c (SYS_FUNC(cacheflush)): Print 2nd argument
using %lu format.  Print 3rd argument as flags.

Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace