core: hle: kernel: Updated implementation of svcSetHeapSize.

- Updates our svcSetHeapSize with latest HOS, furthermore allowing heap size to properly be extended/shrunk.
- Validated with tests https://github.com/Atmosphere-NX/Atmosphere/blob/master/tests/TestSvc/source/test_set_heap_size.cpp.

src/core/hle/kernel/svc_common.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include "common/common_types.h"
+#include "common/literals.h"
 
 namespace Kernel {
 using Handle = u32;
@@ -12,9 +13,13 @@ using Handle = u32;
 
 namespace Kernel::Svc {
 
+using namespace Common::Literals;
+
 constexpr s32 ArgumentHandleCountMax = 0x40;
 constexpr u32 HandleWaitMask{1u << 30};
 
+constexpr inline std::size_t HeapSizeAlignment = 2_MiB;
+
 constexpr inline Handle InvalidHandle = Handle(0);
 
 enum PseudoHandle : Handle {