ASoC: wcd-dsp-utils: Add utilities for wcd dsp

wcd_dsp_utils adds utilities that will be used by the
wcd dsp manager driver. Add helper functions to parse
WDSP image and provide list of segments to be loaded
to memory.

CRs-Fixed: 1049012
Change-Id: I2b1464c2a035a039440e6d3e5122ad3f90da4d1e
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>