wcd_dsp_mgr: Add the WCD DSP manager driver

WCD audio codecs have DSP embedded to perform signal processing on
audio data. The codec driver has control over the DSP clock, power etc,
whereas the DSP memory can be accessed through an different bus slave
interface. In such cases, it is required to make sure the hardware
expected sequences are met for the DSP to function properly. The
wcd-dsp manager driver registers as master to component framework
and provides the ability to sequence the operations between the child
drivers. Upon registration of all children, the wcd-dsp manager driver
parses the wcd dsp image, downloads the image and boots up the DSP.
It invokes the component children to perform the tasks in sequence.

CRs-Fixed: 1049012
Change-Id: I059e1b111c607e49a7cc9a7940cf458e701c73d3
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>