[U-Boot] (no subject)

[Angelo Dureghello]

This patch adds an initial fdt support to the m68k architecture.

It has been tested on stmark2 board, with a devicetree and
CONFIG_DM_SERIAL=y + CONFIG_DM_SPI=y.

----- test log -----

U-Boot 2018.09-00137-g1be43784f1 (Sep 20 2018 - 22:34:42 +0200)

CPU:   Freescale MCF54415 (Mask:a0 Version:2)
       CPU CLK 240 MHz BUS CLK 120 MHz FLB CLK 60 MHz
       INP CLK 30 MHz VCO CLK 480 MHz
SPI:   ready
DRAM:  128 MiB
Loading Environment from SPI Flash... SF: Detected is25lp128 with page size 256 Bytes, erase size 64 KiB, total 16 MiB
*** Warning - bad CRC, using default environment

In:    uart at fc060000
Out:   uart at fc060000
Err:   uart at fc060000
Hit any key to stop autoboot:  0 
SF: Detected is25lp128 with page size 256 Bytes, erase size 64 KiB, total 16 MiB
device 0 offset 0x100000, size 0x700000
SF: 7340032 bytes @ 0x100000 Read: OK
## Booting kernel from Legacy Image at 40001000 ...
   Image Name:   mainline kernel
   Created:      2018-09-14  19:06:13 UTC
   Image Type:   M68K Linux Kernel Image (uncompressed)
   Data Size:    2184848 Bytes = 2.1 MiB
   Load Address: 40001000
   Entry Point:  40001000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK