ARM: dts: msm: Vote for maximum nominal value of DDR freq for msmthorium

On msmthorium, bimc core clock is removed in hardware and  hence client
drivers are required to vote for DDR frequencies instead of BIMC
frequencies. Hence required change to vote for maximum nominal value of
DDR frequency.

Change-Id: I22ffe53d7a70abbfa7ea1b680360454cef901703
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>