davinci-mcasp: extension to use AHCLKX pin as external clock source

From: Urs FÃssler
Date: Fri Feb 06 2015 - 04:30:56 EST


The AHCLKX pin seems not to be supported as external source. The first
patch is a general fix to allow external clock. The second allows you to
select the AHCLKX pin as clock source.

Patch built against v3.19-rc7

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