hv: mod: do not use explicit arch name when including headers

Instead of "#include <x86/foo.h>", use "#include <asm/foo.h>".

In other words, we are adopting the same practice in Linux kernel.

Tracked-On: #5920
Signed-off-by: Liang Yi <yi.liang@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

hypervisor/dm/vuart.c

@@ -34,7 +34,7 @@
 #include <console.h>
 #include <vuart.h>
 #include <vmcs9900.h>
-#include <x86/guest/vm.h>
+#include <asm/guest/vm.h>
 #include <logmsg.h>
 
 #define init_vuart_lock(vu)	spinlock_init(&((vu)->lock))