soc: mediatek: mtk-socinfo: depends on CONFIG_SOC_BUS

The mtk-socinfo driver uses symbols 'soc_device_register' and
'soc_device_unregister' which are part of the bus driver for
System-on-Chip devices.

Select SOC_BUS to make sure that driver is built and the symbols are
available.

Fixes: 423a54d ("soc: mediatek: mtk-socinfo: Add driver for getting chip information")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/cc8f7f7da5bdccce514a320e0ae7468659cf7346.1707327680.git.daniel@makrotopia.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

drivers/soc/mediatek/Kconfig

@@ -72,6 +72,7 @@ config MTK_SOCINFO
 	tristate "MediaTek SoC Information"
 	default y
 	depends on NVMEM_MTK_EFUSE
+	select SOC_BUS
 	help
 	  The MediaTek SoC Information (mtk-socinfo) driver provides
 	  information about the SoC to the userspace including the