ARM: dts: am335x-myirtech-*: Add DT for AM335X MYIR Tech Limited board

This patch adds basic support for MYIR Tech MYC-AM335X CPU Module:
- Up to 1GHz TI AM335X Series ARM Cortex-A8 Processors
- Up to 512MB DDR3 SDRAM
- Up to 512MB Nand Flash

and MYD-AM335X Development Board:
- MYC-AM335X CPU Module as Controller Board
- Serial ports, 4 x USB Host, OTG, 2 x Gigabit Ethernet, CAN, RS485,
  TF, Audio
- Supports HDMI and LCD Display

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Tony Lindgren <tony@atomide.com>