eal: fix build on armv7

eal: fix build on armv7

Caught by OBS on armv7:

In file included from .../lib/librte_eal/include/rte_string_fns.h:21,
                 from .../lib/librte_kvargs/rte_kvargs.c:9:
.../lib/librte_eal/include/rte_common.h:67:37: error: expected '=', ',',
 ';', 'asm' or '__attribute__' before '__rte_aligned'
   67 | typedef uint64_t unaligned_uint64_t __rte_aligned(1);
      |                                     ^~~~~~~~~~~~~
.../lib/librte_eal/include/rte_common.h:68:37: error: expected '=', ',',
 ';', 'asm' or '__attribute__' before '__rte_aligned'
   68 | typedef uint32_t unaligned_uint32_t __rte_aligned(1);
      |                                     ^~~~~~~~~~~~~
.../lib/librte_eal/include/rte_common.h:69:37: error: expected '=', ',',
 ';', 'asm' or '__attribute__' before '__rte_aligned'
   69 | typedef uint16_t unaligned_uint16_t __rte_aligned(1);
      |                                     ^~~~~~~~~~~~~
make[3]: *** [.../mk/internal/rte.compile-pre.mk:116: rte_kvargs.o] Error 1

Move __rte_aligned macro definition before alignment types used by
architectures requiring RTE_ARCH_STRICT_ALIGN like armv7.

Fixes: f35e5b3e07b2 ("replace alignment attributes")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>