ARM: dts: msm: Update VDD scaling minimum frequency for msmtitanium

Update low temperature VDD scaling minimum frequency value for
msmtitanium based on updated frequency voltage mapping.
New frequency value for nominal corner is 1689600KHz.

Change-Id: I032c0ea886572676c53763d904461073994ef2b4
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>