defconfig: some optimizations (stalking Ktoonsez...)

Signed-off-by: task650 <task650@gmail.com>

Revert "Update Makefile"

This reverts commit cce41681d67f2e84d839182c3e68363a63701b7b.
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

(same as in stock. ATT specific change is forced in rpm-regulator.c)

Change-Id: Ib351f8f75437e85fb50ba166dcaf887fac042df5

Makefile: tune for cortex-a15

Signed-off-by: task650 <task650@gmail.com>
M2: otg: fix runaway wakelock

When booting with wall-charger plugged-in state machine transitions to
STATE_B_PERIPHERAL (B_SESS_VLD bit is set in msm_otg_init_sm).

Aftr uplugging, bit is not cleared, and state machine never transitions
to IDLE, consequently msm_otg wakelock is never unlocked.
mm: optimize Kernel Samepage Merging(KSM)
mm: Adjust dirty writeback for IO boost
Enable RTC write

Change-Id: I462458c9147ec663115b807fa4df979977796b2d

Keep forgetting to push this again (I hate pushing sometimes ;) )

Signed-off-by: task650 <task650@gmail.com>