ARM: dts: msm: Update L3 freq mapping at high end for sdm845 v2

The largest L3 frequencies should only be used in high
performance scenarios so update the mapping table to account
for this.

Change-Id: Ie84cd7b6f80a757162ced8a1b6fa248759f4057c
Signed-off-by: Amir Vajid <avajid@codeaurora.org>