powerpc: keymile boards updates

- malloc size 4 MB for all keymile boards
- use generic FDT code for fixing up the DTS
- enable unit-led at startup for keymile boards
- remove some dts updates for keymile boards
- ppc_83xx, kmeter1: take FE/GbE PHYs out of reset
- ppc_83xx, kmeter1: change from Intel Strata to Spansion 64MB flash
  changed from Intel Strata to Spansion 64MB flash and changed flash layout.
+---------+----------+-----------------------+-----------------------------+
| name    | size     | range                 | description                 |
+---------+----------+-----------------------+-----------------------------+
| u-boot  |   768 KB | 0xf0000000-0xf00bffff | for u-boot                  |
| env     |   128 KB | 0xf00c0000-0xf00dffff | for environment             |
| envred  |   128 KB | 0xf00e0000-0xf00fffff | for environment (redundant) |
| ubi0    | 64512 KB | 0xf0100000-0xf3ffffff | ubi0 for ubi volumes        |
+---------+----------+-----------------------+-----------------------------+

Signed-off-by: Heiko Schocher <hs@denx.de>