[PATCH] serial: 8250_mtk: Add ACPI support

[kernel test robot]

Hi Yenchia,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tty/tty-testing]
[also build test WARNING on tty/tty-next tty/tty-linus usb/usb-testing usb/usb-next usb/usb-linus linus/master v6.13-rc7 next-20250115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yenchia-Chen/serial-8250_mtk-Add-ACPI-support/20250114-113715
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
patch link:    https://lore.kernel.org/r/20250114033324.3533292-1-yenchia.chen%40mediatek.com
patch subject: [PATCH] serial: 8250_mtk: Add ACPI support
config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20250116/202501160328.DUMWkTOc-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250116/202501160328.DUMWkTOc-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501160328.DUMWkTOc-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/tty/serial/8250/8250_mtk.c:662:36: warning: 'mtk8250_acpi_match' defined but not used [-Wunused-const-variable=]
     662 | static const struct acpi_device_id mtk8250_acpi_match[] = {
         |                                    ^~~~~~~~~~~~~~~~~~


vim +/mtk8250_acpi_match +662 drivers/tty/serial/8250/8250_mtk.c

   661	
 > 662	static const struct acpi_device_id mtk8250_acpi_match[] = {
   663		{ "MTKI0511", 0 },
   664		{},
   665	};
   666	MODULE_DEVICE_TABLE(acpi, mtk8250_acpi_match);
   667	

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