siteinfo: Move general realloc/malloc values to common-$libc

siteinfo: Move general realloc/malloc values to common-$libc

These are tests for glibc behavior which we have enabled in uclibc.
Note that if we ever disable MALLOC_GLIBC_COMPAT the uclibc tests
will need to be changed (but I believe this would also entail massive
patching to the rest of userspace so this should be unlikely).

Signed-off-by: Tom Rini <tom_rini@mentor.com>