CHROMIUM: mfd: s5m-core: Enable low-jitter via DT.

CHROMIUM: mfd: s5m-core: Enable low-jitter via DT.

Provide facility via device tree to activate the low-jitter
capababilities of the 32Khz clocks (BT, CP, AP).  Note the feature is
enabled for all the clocks or none per the design

Additionally fixed two small nits:
1. added __devinit to declaration of probe function
2. fixed function name of s5m87xx_i2c_parse_dt_pdata for the case when
   CONFIG_OF is undefined

BUG=chrome-os-partner:17833 chrome-os-partner:17858
TEST=manual
1. boot kernel, login as root
2. examine CTRL1 (0xa) register and see Low Jitter_EN bit (<3>) is
enabled for the spring design.
  i2cget -y -f 0 0x66 0xa
  0xf

Signed-off-by: Todd Broch <tbroch@chromium.org>
Change-Id: I80750a3049806692c1c1e214982577f2f39899e1
Reviewed-on: https://gerrit.chromium.org/gerrit/43624
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>