rpm: Enable MIPS64 N32 transactions

rpm: Enable MIPS64 N32 transactions

In a multilib install RPM will break a conflict using the transaction color.
However, by default MIPS64 N32 transactions are not enabled.

This change always enables them.  This is effectively a no-op on non-MIPS
systems, and required if we need to support N32 on MIPS.

(From OE-Core rev: dd86624034574484574d75adfcf68c2df4a7a6b7)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>