msm: board-9615-regulator: Change S1 and L9 regulator values

Change the values of always_on for S1 and L9 to 0 so that the
regulator framework does not force these regulators to be at
their maximum voltage when no consumers are active. Also
change the values of min_uV for S1 and L9, corresponding to
Vdd_dig and Vdd_mem voltages, to 0.5V and 0.75 V respectively.

Change-Id: I7a4118d3d277c70491c631d1c0fb8b3bc5faa55f
Signed-off-by: Chandra Ramachandran <cramacha@codeaurora.org>