Linux/linux ad77431. MAINTAINERS

MAINTAINERS: Add tree link for Intel pin control driver

Intel pin control driver gets its own tree. Update MAINTAINERS accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg at linux.intel.com>
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