tools/nolibc: drop test for getauxval(AT_PAGESZ)

Other testcases are already testing the same functionality:
* auxv_AT_UID tests getauxval() in general.
* test_getpagesize() tests pagesize() which directly calls
  getauxval(AT_PAGESZ).

Link: https://lore.kernel.org/r/20231007-nolibc-auxval-pagesz-v1-1-af00804edead@weissschuh.net


Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>