x86/paravirt: Use CONFIG_PARAVIRT_XXL instead of CONFIG_PARAVIRT

There are some code parts using CONFIG_PARAVIRT for Xen pvops related
issues instead of the more stringent CONFIG_PARAVIRT_XXL.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200815100641.26362-4-jgross@suse.com