v3dv: expose VK_KHR_shader_float_controls and VK_KHR_spirv_1_4
We don't have a lot of room here, just exposing what the hardware does.
CTS results for dEQP-VK.spirv_assembly.instruction.*.float_controls.*
:
Passed: 1110/7275 (15.3%)
Failed: 0/7275 (0.0%)
Not supported: 6165/7275 (84.7%)
Warnings: 0/7275 (0.0%)
Waived: 0/7275 (0.0%)
Also exposing SPIR-V 1.4, since we seem to be passing all the relevant tests.