bus/dpaa: fix 64-bit arch detection

bus/dpaa: fix 64-bit arch detection

There is no standard saying that __WORDSIZE should be defined or in
what include it should be defined. Use RTE_ARCH_64 instead.

This solves a warning when building with musl libc:

 warning: "__WORDSIZE" is not defined, evaluates to 0 [-Wundef]

Fixes: 847ee3bd0d1f ("bus/dpaa: support FMAN frame queue lookup")
Cc: stable@dpdk.org
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Acked-by: David Marchand <david.marchand@redhat.com>