radv: consider allocated command buffers in the initial state.

radv: consider allocated command buffers in the initial state.

The Vulkan spec says:
    "When a command buffer is allocated, it is in the initial state.
     Some commands are able to reset a command buffer (or a set of
     command buffers) back to this state from any of the executable,
     recording or invalid state. Command buffers in the initial state
     can only be moved to the recording state, or freed."

Because the status wasn't initialized, it was implicitly set to
RADV_CMD_BUFFER_STATUS_INVALID and that triggered a reset for newly
allocated command buffers.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19506>