validation: renaming in odp_time.c
validation: renaming in odp_time.c

Renaming of things which may be, one day, exported in a lib.
This renaming is important, as it creates consistency between test
symbols, which is needed if things get eventually exported in the lib.
Also, tests are often created from other tests: Fixing the first exemples
will help geting future tests better.
Note that time API is actually part of the "system" API modules.
Hence the renaming to systen_*.

Things that are candidate to be exported in the lib in the future
have been named as follows:
 -Tests, i.e. functions which are used in CUNIT testsuites are named:
    <Module>_test_*
 -Test arrays, i.e. arrays of CU_TestInfo, listing the test functions
  belonging to a suite, are called:
    <Module>_suite[_*]
  where the possible suffix can be used if many suites are declared.
 -CUNIT suite init and termination functions are called:
    <Module>_suite[_*]_init() and <Module>_suite[_*]_term()
  respectively.
 -Suite arrays, i.e. arrays of CU_SuiteInfo used in executables are called:
    <Module>_suites[_*]
  where the possible suffix identifies the executable using it, if many.
 -Main function(s), are called:
    <Module>_main[_*]
  where the possible suffix identifies the executable using it

Signed-off-by: Christophe Milard <99616a981fa4477cda708a70f78076761c0c9f1c@linaro.org>
Reviewed-by: Stuart Haslam <1fce01f364ef5298e64e07a42e08efeef153fa98@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

dkrot/odp,ravineet-singh/odp,erachmi/odp,nmorey/odp,rsalveti/odp,rsalveti/odp,dkrot/odp,rsalveti/odp,erachmi/odp,kalray/odp-mppa,kalray/odp-mppa,ravineet-singh/odp,dkrot/odp,mike-holmes-linaro/odp,kalray/odp-mppa,kalray/odp-mppa,mike-holmes-linaro/odp,kalray/odp-mppa,mike-holmes-linaro/odp,nmorey/odp,kalray/odp-mppa,rsalveti/odp,kalray/odp-mppa,erachmi/odp,nmorey/odp,nmorey/odp,mike-holmes-linaro/odp,rsalveti/odp,ravineet-singh/odp,ravineet-singh/odp,dkrot/odp,erachmi/odp