[vmware] Expose GuestRPC mechanism in 64-bit builds

The GuestRPC mechanism (used for VMWARE_SETTINGS and CONSOLE_VMWARE)
does not use any real-mode code and so can be exposed in both 64-bit
and 32-bit builds.

Reported-by: Matthew Helton <mwhelton@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/Makefile

 SRCDIRS		+= arch/i386/interface/pxe
 SRCDIRS		+= arch/i386/interface/pxeparent
 SRCDIRS 	+= arch/i386/interface/syslinux
-SRCDIRS		+= arch/i386/interface/vmware
 SRCDIRS		+= arch/i386/hci/commands
 
 # Include common x86 Makefile

src/arch/x86/Makefile

 #
 SRCDIRS		+= arch/x86/core
 SRCDIRS		+= arch/x86/interface/efi
+SRCDIRS		+= arch/x86/interface/vmware
 SRCDIRS		+= arch/x86/prefix
 SRCDIRS		+= arch/x86/hci/commands
 SRCDIRS		+= arch/x86/drivers/xen