ENGR00153424-1 turn on ddr clock for audio buffers in external ram

Audio is broken if buffers are in external ram and the external
ram clock is turned off.  To fix it:
 * In platform data, ext_ram is replaced with two settings:
   ext_ram_rx and ext_ram_tx which control whether the buffer
   will be in iram or external ram.
 * imx-pcm.c no longer hardwired to put all capture streams in
   external ram.
 * if IRAM is disabled in the defconfig or if iram_alloc fails,
   then ext_ram_rx or ext_ram_tx are updated so they will
   show whether the buffers were allocated in external ram
   or iram.
 * During audio playback or capture, enable external ram clock
   if the buffer is in external ram.

Signed-off-by: Alan Tull <alan.tull@freescale.com>

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