x86/paravirt: Introduce new paravirt-base.h header

x86/paravirt: Introduce new paravirt-base.h header

Move the pv_info related definitions and the declarations of the global
paravirt function primitives into a new header file paravirt-base.h.

Use that header instead of paravirt_types.h in ptrace.h.

Additionally, this is a preparation to reduce the include hell with paravirt
enabled.

  [ bp: Massage commit message. ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260105110520.21356-14-jgross@suse.com