mpc85xx: update HiveAP-330 dts

mpc85xx: update HiveAP-330 dts

initramfs is not the proper name for this, as it stores a boot ramdisk
and not a filesystem. Update the name to reflect it's usage correctly.

If CMDLINE_OVERRIDE is enabled, the chosen bootargs aren't used at all.
Drop them from the device tree source file to not cause confusion.

Remove the noinitrd bootarg. Due to the empty ramdisk this parameter
isn't required any longer:

  [    0.000000] Initrd not found or empty - disabling initrd

Use the LEDE mtd-mac-address* device tree properties to set the interfaces
MAC-Addresses.

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>