test and util: maintain consistency in the usage of ARRAY_LENGTH macro

ARRAY_LENGTH macro is used in perf's cairo-perf.h, src's cairoint.h,
test's cairo-test.h and in some internal header files of util's
directory.So to maintain consistency ARRAY_SIZE is replaced with
ARRAY_LENGTH macro.

Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-by: Bryce Harrington <b.harrington@samsung.com>