x86/Voyager: remove PARAVIRT Kconfig quirk

Remove this Kconfig quirk:

 config PARAVIRT
 	bool "Enable paravirtualization code"
	depends on !X86_VOYAGER
 	help

Voyager support built into a kernel does not preclude paravirt support.

Signed-off-by: Ingo Molnar <mingo@elte.hu>