Revert "ARM: dts: msm: Update MX turbo voltage to 1.3375V on 8916"

PM8916 Mx LDO has a max allowed voltage of 1.2875V. The MX rail needs
to be at 1.2875V when APC is operating in the TURBO corner.

This reverts commit 6b0be149.

Change-Id: I80a5c91567857e95096bc79b6d722a0bc249165d
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>