[][kernel][mt7988][dts][Fix typo for spi1]

[Description]
Fix typo for spi1, group spi1_1 is not supported.

[Release-log]
N/A

Change-Id: I6770395165b760c88a897207e784f069fd2094e3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7144186
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988a-dsa-10g-spim-nor.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988a-dsa-10g-spim-nor.dts
index 8d195f4..99677f6 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988a-dsa-10g-spim-nor.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988a-dsa-10g-spim-nor.dts
@@ -164,7 +164,7 @@
 	spic_pins: spi1-pins {
 		mux {
 			function = "spi";
-			groups = "spi1_1";
+			groups = "spi1";
 		};
 	};