CM3: AM43XX Add support for IO Isolation

Allow configuration of PRCM IO Isolation control in order to put IOs
into isolation and use DS0 states of pins. Implementation based on VTT
toggle control for GPIO0. The setting of isolation is controllable from
the A9 and will only be set if bit 10 in the IPC register has been set
from the A9 processor.

This is used to control VTT regulator on AM43xx when it is not connected
to a GPIO other than GPIO0 but can be used to control other things based
on the configuration of the DS_PAD_CONFIG bits inside the CTRL_CONF_*
register corresponding to the desired pin.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
CM3: ddr: Only clear DDR reset line for AM335x

DDR reset line on am335x does not behave the same way as that on am43xx
so only clear it for am335x DDR3 boards.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
CM3: Update the pre-build binary to support am43xx IO isolation

Firmware version 0x185

Signed-off-by: Russ Dill <Russ.Dill@ti.com>