boards: qemu_x86_coverage: remove board testing coverage

This board was added to test coverage feature when coverage was
introduced. This is now being testing with other boards and
configurations on a regular basis, so no need for this extra overhead in
CI.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

boards/x86/qemu_x86/qemu_x86_coverage.dts

@@ -1,6 +0,0 @@
-/*
- * Copyright (c) 2019 Intel Corporation.
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "qemu_x86.dts"

boards/x86/qemu_x86/qemu_x86_coverage.yaml

@@ -1,13 +0,0 @@
-identifier: qemu_x86_coverage
-name: QEMU Emulation for X86 (Code coverage enabled)
-type: qemu
-arch: x86
-simulation: qemu
-toolchain:
-  - zephyr
-  - xtools
-testing:
-  default: true
-  only_tags:
-     - kernel
-     - userspace

boards/x86/qemu_x86/qemu_x86_coverage_defconfig

@@ -1,20 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-CONFIG_SOC_IA32=y
-CONFIG_BOARD_QEMU_X86=y
-CONFIG_HPET_TIMER=y
-CONFIG_PIC_DISABLE=y
-CONFIG_LOAPIC=y
-CONFIG_CONSOLE=y
-CONFIG_SERIAL=y
-CONFIG_UART_NS16550=y
-CONFIG_UART_CONSOLE=y
-CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
-CONFIG_TEST_RANDOM_GENERATOR=y
-CONFIG_X86_MMU=y
-CONFIG_DEBUG_INFO=y
-CONFIG_SCHED_SCALABLE=y
-CONFIG_WAITQ_SCALABLE=y
-CONFIG_COVERAGE=y
-CONFIG_X86_VERY_EARLY_CONSOLE=y
-CONFIG_QEMU_ICOUNT_SHIFT=5