The new node is called "npu_cache".
This way a possibility is offered to choose - thru an overlay - if to
enable the NPU cache or not.
This new node has a dependency with node "npu", so the NPU cache's
status is taken into account only in case node "npu" has status "okay".
Default status value of "npu_cache" is "okay"
(i.e. enable the NPU cache).
Signed-off-by: Wolfgang Betz <wolfgang.betz@st.com>
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