[Accton][as4625-54t] Add new platform

[acctalex]

CPU: Intel Atom Processor C3508 1.6GHZ DDR4 SDRAM: 8GB 2400MHz with ECC(SO-DIMM) DDR41 SPI Flash(boot): 16Mb * 2 M.2 SSD: SATA 32GB MLC EC: IT8528E/VG-I TPM: SLB 9670XQ2.0 FW7.63 INFINEON Management: WGI210AT, INTEL, Out-band Mangement Ethernet port[RJ45] MAC: Broadcom Trident3 X2 BCM562771 1GPHY: BCM54182*3 Ethernet Ports: 48 x 1G Base-T + 6 x 10G SFP+ Power Supply: AC 150W PSU, UMEC, 1+1 redundant load-sharing, hot-swappable Cooling: F2B fixed fan with 3 pcs of 40mmx40mmx28mm 12V B2F fixed fan with 3 pcs of 40mmx40mmx28mm 12V Dimention:350.35mm(L: Depth) x 440mm(W: Width) x 44mm(H: Height)