OMAP4: PM: syscontrol: workaround LPDDR CK IO pull disable

    CK differential IO PADn, PADp values can be same because of a hardware bug in
    EMIF CMD phy. To work around this bug, it is necessary to disable the
    pulls. Though this bug has no functional impact, in OSWR, 500uA saving is
    expected with the workaround for these IOs.

    CDDS no: OMAP4460-1.0BUG00291 (OMAP official errata ID yet to be available).