Fix swapped results arrays in early-proc for sync benchmarks

[JDuchniewicz]

Looking at

sel4bench/apps/sync/src/main.c

Line 199 in 05b7569

sel4utils_create_word_args(producer_args_strings, producer_argv, N_PRODUCER_CONSUMER_ARGS,

and

sel4bench/apps/sync/src/main.c

Line 258 in 05b7569

SYNC_PRODUCER_CONSUMER_FUNC_EP(consumer_func_ep, (*fifo_head == 0), sync_cv_wait, (*fifo_head)--, consumer_to_producer)

The results are accidentally swapped for the EP version of benchmark. This PR fixes that.

The results before the change (run for odroid_c2):

Producer to consumer: 1328(137)
Producer to consumer (early processing): 1302(7)
Consumer to producer: 1310(9)
Consumer to producer (early processing): 1322(136)

One can clearly see that the early processing labels are swapped.
We still have a large spike from the last sample in the Producer to consumer case but I don't really know how to fix it easily.

[lsf37]

Thanks for catching that. Looks good from my side.