clk: mediatek: Kconfig: Allow module build for core mt8192 clocks

Bootloaders must in a way setup the SoC to boot Linux: this means
that it will be possible to decompress a ramdisk and eventually
insert the core clock driver module from there.
Allow module build for all MT8192 clocks by switching to tristate.

Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Chen-Yu Tsai <[e-mail]>
Tested-by: Miles Chen <[e-mail]>
Tested-by: Chen-Yu Tsai <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/mediatek/Kconfig

···
 	  This driver supports MediaTek MT8186 vencsys clocks.
 
 config COMMON_CLK_MT8192
-	bool "Clock driver for MediaTek MT8192"
+	tristate "Clock driver for MediaTek MT8192"
 	depends on ARM64 || COMPILE_TEST
 	select COMMON_CLK_MEDIATEK
 	default ARM64