Fix validation failure in float_controls

Fix validation failure in float_controls

Half of float_controls tests read operation arguments from
SSBO (other half generates them in the code). Whent vertex
stage is tested this SSBO must be decorated as NonWritable.
This change resolves this issue by applying NonWritable
decoration to input SSBO for all tested stages.
Operation output is always saved in fragment stage and to
separate SSBO.

Components: Vulkan

VK-GL-CTS issue: 1543

Affects:
dEQP-VK.spirv_assembly.instruction.compute.float_controls.*
dEQP-VK.spirv_assembly.instruction.graphics.float_controls.*

Change-Id: Iaed891d7b45b2a5f02ce1443dc13a40e24fa2086