Kernel/ScatterGatherList: Add region_name as a part of try_create API

Remove the hardcoded "AHCI Scattered DMA" for region name as it is a
part of a common API. Add region_name parameter to the try_create API
so that this API can be used by other drivers with the correct Memory
region name.

Kernel/Memory/ScatterGatherList.cpp

@@ -8,11 +8,11 @@
 
 namespace Kernel::Memory {
 
-ErrorOr<LockRefPtr<ScatterGatherList>> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size)
+ErrorOr<LockRefPtr<ScatterGatherList>> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size, StringView region_name)
 {
     auto vm_object = TRY(AnonymousVMObject::try_create_with_physical_pages(allocated_pages));
     auto size = TRY(page_round_up((request.block_count() * device_block_size)));
-    auto region = TRY(MM.allocate_kernel_region_with_vmobject(vm_object, size, "AHCI Scattered DMA"sv, Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes));
+    auto region = TRY(MM.allocate_kernel_region_with_vmobject(vm_object, size, region_name, Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes));
 
     return adopt_lock_ref_if_nonnull(new (nothrow) ScatterGatherList(vm_object, move(region)));
 }

Kernel/Memory/ScatterGatherList.h

@@ -19,7 +19,7 @@ namespace Kernel::Memory {
 
 class ScatterGatherList final : public AtomicRefCounted<ScatterGatherList> {
 public:
-    static ErrorOr<LockRefPtr<ScatterGatherList>> try_create(AsyncBlockDeviceRequest&, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size);
+    static ErrorOr<LockRefPtr<ScatterGatherList>> try_create(AsyncBlockDeviceRequest&, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size, StringView region_name);
     VMObject const& vmobject() const { return m_vm_object; }
     VirtualAddress dma_region() const { return m_dma_region->vaddr(); }
     size_t scatters_count() const { return m_vm_object->physical_pages().size(); }

Kernel/Storage/ATA/AHCI/Port.cpp

@@ -429,7 +429,7 @@ Optional<AsyncDeviceRequest::RequestResult> AHCIPort::prepare_and_set_scatter_li
         allocated_dma_regions.append(m_dma_buffers.at(index));
     }
 
-    m_current_scatter_list = Memory::ScatterGatherList::try_create(request, allocated_dma_regions.span(), m_connected_device->block_size()).release_value_but_fixme_should_propagate_errors();
+    m_current_scatter_list = Memory::ScatterGatherList::try_create(request, allocated_dma_regions.span(), m_connected_device->block_size(), "AHCI Scattered DMA"sv).release_value_but_fixme_should_propagate_errors();
     if (!m_current_scatter_list)
         return AsyncDeviceRequest::Failure;
     if (request.request_type() == AsyncBlockDeviceRequest::Write) {