As per the latest revision F of public TRM for DRA7/AM57xx SoCs
SPRUHZ6F[1] (April 2016), L4Per and L3init power domains now operate in
always "ON" mode due to asymmetric aging limitations. Update the same

[1] http://www.ti.com/lit/pdf/spruhz6Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>