Remove unconditional depth_clamping for 1.1.2

Remove unconditional depth_clamping for 1.1.2

Changed depthClampEnable from VK_TRUE to VK_FALSE where it is not needed.
Depth clamp specific tests in builtin_var.fragdepth set as not supported for incompatible systems.

Affects:
dEQP-VK.pipeline.early_destroy.*
dEQP-VK.api.object_management.*.graphics_pipeline
dEQP-VK.binding_model.shader_access.*
dEQP-VK.glsl.builtin_var.fragdepth.*
dEQP-VK.synchronization.smoke.*
dEQP-VK.device_group.*

Components: Vulkan

VK-GL-CTS issue: 1286

Change-Id: I88271dda6001c63208b28d615ceab20bc597b743