x86/fpu: Move xstate feature masks to fpu_*_cfg

x86/fpu: Move xstate feature masks to fpu_*_cfg

BugLink: https://bugs.launchpad.net/bugs/1967750
Move the feature mask storage to the kernel and user config
structs. Default and maximum feature set are the same for now.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211014230739.352041752@linutronix.de
(cherry picked from commit 1c253ff2287fe31307a67938c4487936db967ff5)
Acked-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>