mvebu: add support for iEi Puzzle-M901/Puzzle-M902

mvebu: add support for iEi Puzzle-M901/Puzzle-M902

 Hardware specification
 ----------------------
 * CN9130 SoC, Quad-core ARMv8 Cortex-72 @ 2200 MHz
 * 4 GB DDR
 * 4 GB eMMC
 * mmcblk0
 - mmcblk0p1    64M  kernel_1
 - mmcblk0p2    64M  kernel_2
 - mmcblk0p3   512M  rootfs_1
 - mmcblk0p4   512M  rootfs_2
 - mmcblk0p5   512M  Reserved
 - mmcblk0p6    64M  Reserved
 - mmcblk0p7   1.8G  rootfs_data

 * 4 MB (SPI Flash)
 * 6 x 2.5 Gigabit  ports (Puzzle-M901)
 - External PHY with 6 ports (AQR112R)

 * 6 x 2.5 Gigabit ports (Puzzle-M902)
 - External PHY with 6 ports (AQR112R)
   3 x 10 Gigabit ports (Puzzle-M902)
 - External PHY with 3 ports (AQR113R)

 * 4 x Front panel LED
 * 1 x USB 3.0
 * Reset button on Rear panel
 * UART (115200 8N1,header on PCB)

 Flash instructions:
    The original firmware is based on OpenWrt.
    Flash firmware using LuCI and CLI

Signed-off-by: Ian Chang <ianchang@ieiworld.com>
(cherry picked from commit 70c75965a97799b44871249c205bad48fea9a4ae)
Signed-off-by: Daniel Golle <daniel@makrotopia.org>