x86: broadwell: Add a northbridge driver

Add a driver for the broadwell northbridge. This sets up the location of
several blocks of registers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by

x86: broadwell: Add a northbridge driver

Add a driver for the broadwell northbridge. This sets up the location of
several blocks of registers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>

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