of: Add of_get_cpu_hwid() to read hardware ID from CPU nodes

There are various open coded implementions parsing the CPU node 'reg'
property which contains the CPU's hardware ID. Introduce a new function,
of_get_cpu_hwid(), to read the hardware ID.

All the callers should be DT only code, so no need for an empty
function.

Cc: Frank Rowand <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Tested-by: Florian Fainelli <[email protected]>
Reviewed-by: Sudeep Holla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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