mainboards: Don’t select `CONSOLE_POST`

Currently, it’s impossible for the user to select `NO_POST`, for boards
selecting `CONSOLE_POST` in their config.

```
warning: (BOARD_SPECIFIC_OPTIONS) selects CONSOLE_POST which has unmet
direct dependencies (VENDOR_SIEMENS && BOARD_SIEMENS_MC_BDX1 || !NO_POST)
```

This is currently done for Intel Camelback Mountain and Siemens MC-BDX1.

Selecting the option `CONSOLE_POST` in board specific configuration is
not a good idea, as this should be user configurable over Kconfig, and
also the tree-wide defaults should be the same for these options.

Kconfig is different, as commit 97535558f1 (mainboard/{google,intel}:
Change config option selection) only touch the Intel board.

Change-Id: I91c1e0cb92ed218b6bbc7c33759b91f748cf6f51
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/18878
Tested-by: build bot (Jenkins)
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
2 files changed