video_core: Fix some cases of "Attempted to track non-GPU memory" (#2447)

* memory: Consider flexible mappings as gpu accessible

Multiple guest apps do this with perfectly valid sharps in simple shaders. This needs some hw testing to see how it is handled but for now doesnt hurt to handle it

* memory: Clamp large buffers to mapped area

Sometimes huge buffers can be bound that start on some valid mapping but arent fully contained by it. It is not reasonable to expect the game needing all of the memory, so clamp the size to avoid the gpu tracking assert

* clang-format fix

---------

Co-authored-by: georgemoralis <giorgosmrls@gmail.com>

src/core/memory.h

@@ -164,6 +164,8 @@ public:
         return virtual_addr >= vma_map.begin()->first && virtual_addr < end_addr;
     }
 
+    u64 ClampRangeSize(VAddr virtual_addr, u64 size);
+
     bool TryWriteBacking(void* address, const void* data, u32 num_bytes);
 
     void SetupMemoryRegions(u64 flexible_size, bool use_extended_mem1, bool use_extended_mem2);