mpc85xx: Add Aerohive HiveAP-330 Access Point

The following adds the Aerohive HiveAP-330 Access Point to LEDE under
the mpc85xx/p1020 subtarget.

Hardware:
- SoC: Freescale P1020NSE2DFB
- NAND: Intel JS28F512M29EWH 64MB
- Memory: 2x ProMOS V59C1G01168QBJ3 128MB (Total of 256MB)
- 2.4GHz WiFi: Atheros AR9390-AL1A
- 5.0GHz WiFi: Atheros AR9390-AL1A
- Eth1: Atheros AR8035-A PoE
- Eth2: Atheros AR8035-A
- TPM: Atmel AT97SC3204
- LED Driver: TI LP5521

Flashing:
1. Hook into UART (9600 baud) and enter U-Boot. You may need to enter a
password of administrator or AhNf?d@ta06 if prompted.
2. Once in U-Boot, tftp boot the initramfs image:
    dhcp;
    tftpboot 0x1000000 192.168.1.101:lede-
mpc85xx-p1020-hiveap-330-initramfs.zImage;
    tftpboot 0x6000000 192.168.1.101:lede-mpc85xx-p1020-hiveap-330.fdt;
    bootm 0x1000000 - 0x6000000;
3. Once booted, scp over the sysupgrade file and sysupgrade the device
to flash LEDE to the NAND.
    sysupgrade /tmp/lede-mpc85xx-p1020-hiveap-330-sysupgrade.img

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>