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/debug/uart16550.c

@@ -5,12 +5,12 @@
  */
 
 #include <types.h>
-#include <x86/lib/spinlock.h>
+#include <asm/lib/spinlock.h>
 #include <pci.h>
-#include <x86/pgtable.h>
+#include <asm/pgtable.h>
 #include <uart16550.h>
-#include <x86/io.h>
-#include <x86/mmu.h>
+#include <asm/io.h>
+#include <asm/mmu.h>
 
 #define MAX_BDF_LEN 8