r600g: Properly update DB_SHADER_CONTROL in evergreen_pipe_shader_ps().
r600g: Properly update DB_SHADER_CONTROL in evergreen_pipe_shader_ps().

Disable Z_EXPORT / STENCIL_EXPORT / KILL_ENABLE again if a shader doesn't
use those. This is similar to 0a6f09a76a416b8672e149c520aa5bef33174223.

Signed-off-by: Henri Verbeet <fa9c81d52bf7e42f4eca779fafc7ac8cc1c787d8@gmail.com>

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