MAINTAINERS: Add some information to PARAVIRT_OPS entry

Most patches for paravirt_ops are going through the tip tree, as those
patches tend to touch x86 specific files a lot.

Add the x86 ML and the tip tree to the PARAVIRT_OPS MAINTAINERS entry
in order to reflect that.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20211104095955.4813-1-jgross@suse.com

MAINTAINERS

@@ -14191,7 +14191,9 @@ M:	Juergen Gross <jgross@suse.com>
 M:	Deep Shah <sdeep@vmware.com>
 M:	"VMware, Inc." <pv-drivers@vmware.com>
 L:	virtualization@lists.linux-foundation.org
+L:	x86@kernel.org
 S:	Supported
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
 F:	Documentation/virt/paravirt_ops.rst
 F:	arch/*/include/asm/paravirt*.h
 F:	arch/*/kernel/paravirt*