AMD Radeon R5 M330 is not listed in Blender Preferences my AMD Radeon R5 M330 GPU is not listed in the Blender preferences. I'm using windows 10, intel core i3, 8GB RAM, 2.0 GHz Processor, and 2GB Graphics Card(AMD).
And I'm using Blender 2.81a.
After a quick search I found this:

OpenCL is supported for GPU rendering with AMD graphics cards. Blender supports graphics cards with GCN generation 2 and above. 
https://docs.blender.org/manual/en/dev/render/cycles/gpu_rendering.html 

Your GPU is GCN 1st generation. 
https://en.wikipedia.org/wiki/List_of_AMD_graphics_processing_units#Radeon_R5/R7/R9_M300_series