CHROMIUM: dts: spring: Explicitly disable unused LDOs

CHROMIUM: dts: spring: Explicitly disable unused LDOs

Some LDO's are enabled by default at poweron but unused in Spring.
This CL disables them explicitly.

Signed-off-by: Todd Broch <tbroch@chromium.org>
BUG=chrome-os-partner:19067
TEST=manual
  ldo_base=0x5e
  for ldo in 4 5 11 13 17 ; do
    echo -n "LDO${ldo}: "
    i2cget -y -f 0 0x66 $(($ldo_base + $ldo))
  done

LDO4: 0x04
LDO5: 0x04
LDO11: 0x14
LDO13: 0x14
LDO17: 0x28
Note all bits <7:6> are zero'd

Change-Id: I9e8f6966a0a573f622f86cd07aeb7d61e495db1b
Reviewed-on: https://gerrit.chromium.org/gerrit/49718
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>