bcm2835-i2s: setup clock only if CPU is clock master
Code ported from bcm2708-i2s driver in Raspberry Pi tree. RPi commit c14827ec ("bcm2708: Allow option card devices to be configured via DT") Original work by Zoltan Szenczi, committed to RPi tree by Phil Elwell. Signed-off-by:Matthias Reichl <hias@horus.com>
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