Fixed main memory type selection algorithm for Raspberry Pi

In function FindMemoryPreferences, not requiring HOST_CACHED memory, as some platforms may not have it. See #362 - thanks @cos-public

include/vk_mem_alloc.h

@@ -3704,18 +3704,21 @@ static bool FindMemoryPreferences(
         // CPU random access - e.g. a buffer written to or transferred from GPU to read back on CPU.
         if(hostAccessRandom)
         {
-            if(!isIntegratedGPU && deviceAccess && hostAccessAllowTransferInstead && !preferHost)
+            // Prefer cached. Cannot require it, because some platforms don't have it (e.g. Raspberry Pi - see #362)!
+            outPreferredFlags |= VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
+
+            if (!isIntegratedGPU && deviceAccess && hostAccessAllowTransferInstead && !preferHost)
             {
                 // Nice if it will end up in HOST_VISIBLE, but more importantly prefer DEVICE_LOCAL.
                 // Omitting HOST_VISIBLE here is intentional.
                 // In case there is DEVICE_LOCAL | HOST_VISIBLE | HOST_CACHED, it will pick that one.
                 // Otherwise, this will give same weight to DEVICE_LOCAL as HOST_VISIBLE | HOST_CACHED and select the former if occurs first on the list.
-                outPreferredFlags |= VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
+                outPreferredFlags |= VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
             }
             else
             {
-                // Always CPU memory, cached.
-                outRequiredFlags |= VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
+                // Always CPU memory.
+                outRequiredFlags |= VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;
             }
         }
         // CPU sequential write - may be CPU or host-visible GPU memory, uncached and write-combined.