xen/arm: Use asm/ rather than asm-arm/ when including header

All the arch headers (i.e under asm-arm) are included using "asm/*.h".

To stay consistent, remove the only instance where "asm-arm/*.h" is
used.

Take the opportunity to move the inclusion with the rest of the asm/
include.

Signed-off-by: Julien Grall <julien@xen.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/include/asm-arm/domain.h

@@ -9,10 +9,10 @@
 #include <asm/mmio.h>
 #include <asm/gic.h>
 #include <asm/vgic.h>
+#include <asm/vpl011.h>
 #include <public/hvm/params.h>
 #include <xen/serial.h>
 #include <xen/rbtree.h>
-#include <asm-arm/vpl011.h>
 
 struct hvm_domain
 {