When x32 is the tuning for a x86 MACHINE, the kernel should also have
CONFIG_X86_X32=y. This adds a x32 fragment that can be used to trigger
the right ABI.
The commit also contains a check for mx32 in TUNE_FEATURES, and if
present, the new fragment will be appended to KERNEL_FEATURES and
trigger the support in the kernel.
cc: Saul Wold <sgw@linux.intel.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
