openpilot kernel fix from 209 to 207 (#2006)

* Fix openpilot kernel from 209 to 206

1. Use push_movement_ops conditions in _movement_op. Don't push
PAD or check if the ops are safe to be pushed with PAD

2. Don't push if all the op.buffers are realized

* change ALLOWED_KERNEL_COUNT to 206 for openpilot

* don't push through sourceless buffers

* change the tests to adjust kernel counts for new behaviour

* restore pushing of movement ops through childless buffer

* don't push EXPAND, causes OOM

* allow push of intermediate movement ops

* adding new test behaviour

* modifying external_test_opt for new behaviour

* restore old tests

* Reenable push of EXPAND and introduce new tests

I was wrong intially thinking EXPAND can cause OOM and hence I had
disabled it. Since it is 0 stride and doesn't allocate memory its cool

* Don't push EXPAND above LoadOps LB. This is causing OOM

* Push should be decided on movement root of bufs

To check if ast.op.buffers is sourceless/ realized go the the movement
root and then decide if pushing should be done or not

* refactor for readability

* use .base instead

* don't push expand, bad memory/compute consumption

* restrict push of reshape, seeing improvement

* push reshape if unary without further check

* disable PAD solves convnext kernel count increase

* reenable test_cache_binaryop_transpose

* small nit

.github/workflows/test.yml

@@ -154,7 +154,7 @@ jobs:
       - if: ${{ matrix.task == 'openpilot' }}
         name: Test openpilot model compile and size
         run: |
-          DEBUG=2 ALLOWED_KERNEL_COUNT=209 VALIDTEST=1 FLOAT16=1 DEBUGCL=1 GPU=1 IMAGE=2 python openpilot/compile.py
+          DEBUG=2 ALLOWED_KERNEL_COUNT=207 VALIDTEST=1 FLOAT16=1 DEBUGCL=1 GPU=1 IMAGE=2 python openpilot/compile.py
           python -c 'import os; assert os.path.getsize("/tmp/output.thneed") < 100_000_000'
       - if: ${{ matrix.task == 'openpilot' }}
         name: Test openpilot model correctness (float32)