ARM: dts: msm: Add vdd corner to ahb level mapping for sdm845

Add different vdd corner levels supported on current platform
and required ahb voting level for each vdd corner level at
the same index.

CRs-Fixed: 2019539
Change-Id: Id7c6dd2ae4b16a0fa51a3d7f8ed7018109364c4e
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>