M2: regulators: fixup: make RPM_VREG_ID_PM8921_S2 regulator sleep_selectable

M2: ATT: Increase frequency for RPM_VREG_ID_PM8921_S2 regulator to 2.4.

Change-Id: Ib351f8f75437e85fb50ba166dcaf887fac042df5
d2: Disable standalone power collapse

 * This is causing Krait watchdog timeouts. Other Krait devices such as
   Mako experience the same failure.
 * Disable it (same as stock) to stop the crashes and allow me to sleep again.

Change-Id: I2db4525b4271b5d762a537bc785f3344e5fa9be2
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_kernel_samsung_d2 into jb-mr1