ARM: dts: msm: update SMPS 11 minimum voltage for msm8994

Currently, PM8994 SMPS 11 is configured with a minimum voltage of 725 mV.
However, the APC1 CPR regulator device which is a consumer of S11
may need to request voltages as low as 700 mV. Therefore, reduce the
minimum allowed S11 voltage to 700 mV so that such requests can succeed.

CRs-Fixed: 773253
Change-Id: I4dc2b74163e0173207abc7250d9409d8dedb2b0b
Signed-off-by: Ke Liu <keliu@codeaurora.org>