freedreno/a3xx: add back a few stalls

Technically we should not need these.  CP_LOAD_STATE can be pipelined.
But removing them broke a few piglit tests, like fbo-depth-
GL_DEPTH_COMPONENT24-readpixels.  I expect these are just masking a
problem elsewhere, or perhaps they are only needed under some more
specific circumstances.  But until that is understood properly, give
back a bit of the perf boost we got from c63450e8.

Signed-off-by: Rob Clark <[email protected]>

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