ARM: dts: msm: Add external codec for MSM8909 IoE Reference board

Add external codec support for MSM8909 MTP reference design.
Change codec reset GPIO, as GPIO has been changed in reference
design. Change dmic frequency as per HW team suggestion.
Remove unused routing paths.

Change-Id: Ide19a7725088e425aa4bb423fca74fe9a0f00884
Signed-off-by: Viraja Kommaraju <virajak@codeaurora.org>