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2019-12-15x86: apl: Add PUNIT driverSimon Glass1-0/+94
Add a driver for the Apollo Lake P-unit (power unit). It is modelled as a syscon driver since it only needs to be probed. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>