tests/kmstest: inverse the order of LDADD libraries

The utils library depends on libdrm. Flip the order, orderwise we might
error during link stage like below:

  CC       main.o
  CCLD     kmstest
/usr/bin/ld: ../../tests/util/.libs/libutil.a(libutil_la-kms.o):
undefined reference to symbol 'drmOpen'

Reported-by: Tom Stellard <thomas.stellard@amd.com>
Tested-by: Tom Stellard <thomas.stellard@amd.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>