boards: minnowboard: remove untested and old board

Remove minnowboard configuration which is very basic and can be brought
back by just taking another X86 configuration. We have not tested this
board for a while and it is not being used actively, so remove it.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

boards/x86/minnowboard/Kconfig.board

@@ -133,7 +133,6 @@
     ('boards/riscv/zedboard_pulpino/doc/zedboard_pulpino', 'boards/riscv/zedboard_pulpino/doc/index'),
     ('boards/x86/arduino_101/doc/board', 'boards/x86/arduino_101/doc/index'),
     ('boards/x86/galileo/doc/galileo', 'boards/x86/galileo/doc/index'),
-    ('boards/x86/minnowboard/doc/minnowboard', 'boards/x86/minnowboard/doc/index'),
     ('boards/x86/qemu_x86/doc/board', 'boards/x86/qemu_x86/doc/index'),
     ('boards/x86/tinytile/doc/board', 'boards/x86/tinytile/doc/index'),
     ('boards/x86/up_squared/doc/up_squared', 'boards/x86/up_squared/doc/index'),

boards/x86/minnowboard/Kconfig.defconfig

@@ -1,10 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 cmake_minimum_required(VERSION 3.13.1)
-if(BOARD STREQUAL "minnowboard")
-  set(CONF_FILE prj_fp.conf)
-endif()
-
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(app_kernel)