it8xxx2_evb should not define TICKLESS_CAPABLE

[mengxianglinx]

Describe the bug
In boards/riscv/it8xxx2_evb/it8xxx2_evb_defconfig CONFIG_TICKLESS_CAPABLE=y while this configure is not user-configurable, it causes build failure.

To Reproduce
Steps to reproduce the behavior:

1. twister -T tests/subsys/logging/log_core_additional/ -p it8xxx2_evb

Expected behavior
Test case PASS

Logs and console output
error: TICKLESS_CAPABLE (defined at drivers/timer/Kconfig:332) is assigned in a configuration file,
but is not directly user-configurable (has no prompt). It gets its value indirectly from other
symbols. See http://docs.zephyrproject.org/latest/reference/kconfig/CONFIG_TICKLESS_CAPABLE.html
and/or look up TICKLESS_CAPABLE in the menuconfig/guiconfig interface. The Application Development
Primer, Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual
might be helpful too.

Environment (please complete the following information):

• OS: (e.g. Linux, MacOS, Windows)
• Toolchain (e.g Zephyr SDK, ...)
• Commit SHA or Version used

Additional context
Add any other context about the problem here.

[KangJianX]

Same problem here, CI build failed when submit testcases PRs.