clk: mediatek: add clock driver support for MediaTek MT7988 SoC

This patch adds clock driver support for MediaTek MT7988 SoC

diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
index 1decf31..e74c6f9 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/drivers/clk/mediatek/Makefile
@@ -9,6 +9,7 @@
 obj-$(CONFIG_TARGET_MT7629) += clk-mt7629.o
 obj-$(CONFIG_TARGET_MT7986) += clk-mt7986.o
 obj-$(CONFIG_TARGET_MT7981) += clk-mt7981.o
+obj-$(CONFIG_TARGET_MT7988) += clk-mt7988.o
 obj-$(CONFIG_TARGET_MT8183) += clk-mt8183.o
 obj-$(CONFIG_TARGET_MT8516) += clk-mt8516.o
 obj-$(CONFIG_TARGET_MT8518) += clk-mt8518.o