sstate: Drop pseudo exclusion

Now that pseudo-native always includes statx support and we have sanity
checks on pseudo-native to ensure it always contains a minimum feature set,
we no longer need to mark pseudo-native as distro specific. This fixes
eSDK build problems.

[YOCTO #14428]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3279e43f)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>