turnip: enable VK_KHR_16bit_storage on A650

A650 can use the same SSBO descriptor for both 32-bit and 16-bit access,
which makes it easy to enable this extension.

Passes tests that run under:

dEQP-VK.spirv_assembly.instruction.*.16bit_storage.*

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
49 jobs for !4695 with turnip1
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