radv: fix clearing CMASK layers on GFX9+ & init CMASK properly
Fixes various CTS failures with RADV_DEBUG=forcecompress. No CTS regressions on Sienna, Polaris10 and Pitcairn.
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Fixes various CTS failures with RADV_DEBUG=forcecompress. No CTS regressions on Sienna, Polaris10 and Pitcairn.