radeon: place context-related functions first in r600_pipe_common.c
radeon: place context-related functions first in r600_pipe_common.c

To follow the unwritten convention of r600g and radeonsi.

Reviewed-by: Michel Dänzer <242b79f0804cf52679d58f27ed754158c1323c75@amd.com>
Reviewed-by: Tom Stellard <85590917cb30a670bf23f5b4273617f8815d1e87@amd.com>

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