xtensa: add flat support
xtensa: add flat support

Add the arch-specific header for flat support on xtensa in preparation
for the Xtensa S6000 nommu port.

Signed-off-by: Oskar Schirmer <999a3419d9959d3c39b11dcc67d79c7888b4b765@emlix.com>
Signed-off-by: Johannes Weiner <9ec2b9d5f2203d75c2b0f7885bd663d9d57a2d20@emlix.com>
Signed-off-by: Chris Zankel <711c73f64afdce07b7e38039a96d2224209e9a6c@zankel.net>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs