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[UWP] Huge performance drop when switching to landscape mode on UWP10 devices with Adreno 305 GPU

Steps to reproduce:
1. Open attached project ""
2. Build for WSA Universal 10 SDK
3. Deploy on a Windows Phone 10 device with Adreno 305 GPU (eg. Lumia 640/720/1320)
4. Observe UI.Text displaying FPS in portrait mode
5. Turn the phone to landscape mode and observe FPS
Result: FPS drops from 25-50% depending on Unity version(due to increased rendering time)
Alternatively connect profiler and observe the change when switching from portrait to landscape

Not reproducible with WSA Universal 8.1 SDK
Not reproducible with other WP10 with different GPU's

Reproducible with:
5.3.1f1, 5.4.3p3, 5.6.0a6 - 25-30% FPS drop
5.5.0p1 - about 50% drop (however by far better performance compared to other versions)

Tested with: Lumia 720, Lumia 1320, Lumia 640(user)

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