[][Refactor mt7981 eth clk to real clk source from clk driver]

[Description]
Refactor mt7981 eth clk to real clk source from clk driver

[Release-log]
N/A

Change-Id: I09cfe5db8b19cf7c074b72effdc2b584984e7307
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5325658
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
index ecece3d..06ef41d 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-clkitg.dtsi
@@ -128,11 +128,11 @@
 			<&topckgen CK_TOP_NET1_D5_D4>,
 			<&topckgen CK_TOP_NET1_D8_D2>,
 			<&topckgen CK_TOP_NET1_D8_D4>,
-			<&topckgen CK_TOP_CB_NET2_800M>,
+			<&clk40m>,
 			<&topckgen CK_TOP_CB_NET2_D4>,
 			<&topckgen CK_TOP_NET2_D4_D2>,
 			<&topckgen CK_TOP_CB_WEDMCU_208M>,
-			<&topckgen CK_TOP_CB_SGM_325M>,
+			<&clk40m>,
 			<&topckgen CK_TOP_CB_RTC_32K>,
 			<&topckgen CK_TOP_CB_RTC_32P7K>,
 			<&topckgen CK_TOP_NFI1X>,
@@ -176,11 +176,11 @@
 			<&topckgen CK_TOP_NETSYS_SEL>,
 			<&topckgen CK_TOP_NETSYS_500M_SEL>,
 			<&topckgen CK_TOP_NETSYS_MCU_SEL>,
-			<&topckgen CK_TOP_NETSYS_2X_SEL>,
-			<&topckgen CK_TOP_SGM_325M_SEL>,
+			<&clk40m>,
+			<&clk40m>,
 			<&topckgen CK_TOP_SGM_REG_SEL>,
 			<&topckgen CK_TOP_NETSYS_500M_SEL>,
-			<&topckgen CK_TOP_NETSYS_2X_SEL>,
+			<&clk40m>,
 			<&topckgen CK_TOP_USB3_PHY_SEL>,
 			<&topckgen CK_TOP_F26M_SEL>,
 			<&topckgen CK_TOP_U2U3_SEL>,