sama5d3xmb: Set default MB as rev.D, which move all the i2c0 slave to i2c1

We still keep the i2c0 slave device in order to be compatiable with
rev.C MB.
In this way, U-Boot can update the dtb if it found the rev.C MB.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3xmb: Don't disable sound when enable ISI as in rev.D MB both works

For rev.C MB,
 1. if sama5d3mb_isi.dtsi is included, then ISI can work and sound
    can't work as i2c0 is disabled.
    In this case, kernel will report some error message about sound.
 2. if sama5d3mb_isi.dtsi is not included, then sound works and ISI
    is disabled.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3x: enable ISI in sama5d31/33/34-ek board

Since in rev.D MB, sound is moved from TWI0 to TWI1, no conflict with
ISI.

In rev.C or before, sound is conflict with ISI. So you can use U-Boot
fdt command to update the dtb, which enable sound and disable ISI.
  setenv enable_sound_in_revC 'fdt set /ahb/apb/i2c@f0014000 status "okay";fdt set /ahb/apb/isi@f0034000 status'
  run enable_sound_in_revC # before run this should load a dtb binary and run fdt addr <dtb addr>

Signed-off-by: Josh Wu <josh.wu@atmel.com>