aarch64: mmu: remove spurious include

remove a spurious include <osv/prio.hh> which seems to be
a merge artifact.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

arch/aarch64/mmu.cc

@@ -74,4 +74,3 @@ bool is_page_fault_write_exclusive(unsigned int esr) {
 }
 
 }
-#include <osv/prio.hh>