Kernel: Remove unnecessary shift operations in Region constructor

The shift operations were originally introduced in af3d3c5 to
record the permission bits set for Region, but now has been
replaced by the method introduced in 5194ab5, so the shift
operations can be removed.

Author: NoobZang

Kernel/Memory/Region.cpp

@@ -32,7 +32,7 @@ Region::Region(NonnullLockRefPtr<VMObject> vmobject, size_t offset_in_vmobject,
     , m_offset_in_vmobject(offset_in_vmobject)
     , m_vmobject(move(vmobject))
     , m_name(move(name))
-    , m_access(access | ((access & 0x7) << 4))
+    , m_access(access)
     , m_shared(shared)
     , m_memory_type(memory_type)
 {
@@ -44,7 +44,7 @@ Region::Region(VirtualRange const& range, NonnullLockRefPtr<VMObject> vmobject,
     , m_offset_in_vmobject(offset_in_vmobject)
     , m_vmobject(move(vmobject))
     , m_name(move(name))
-    , m_access(access | ((access & 0x7) << 4))
+    , m_access(access)
     , m_shared(shared)
     , m_memory_type(memory_type)
 {