msm: board-8960: Add regulator support for KS8851 ethernet device

Update existing regulator consumer mappings to use the new KS8851
regulator names: "vdd-io" and "vdd-phy".  Also, conditionally
remove the "vdd-phy" consumer mapping from the 8921_lvs6
regulator for CDP targets.  This ensures that both regulator_get
calls in the KS8851 driver succeed for CDP and non-CDP targets.

Change-Id: I7c3f3ec25b6a774b89a63955ff7e13f96c9776fa
Signed-off-by: David Collins <collinsd@codeaurora.org>