ath79: improve common DTSI name for TP-Link Archer C5, C7 v1/v2

As the former qca9558_tplink_archer-c7.dtsi is also used for
Archer C5 v1 this patch removes the number from the DTSI name
to indicate that.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/qca9558_tplink_archer-c5-v1.dts

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
 /dts-v1/;
 
-#include "qca9558_tplink_archer-c7.dtsi"
+#include "qca9558_tplink_archer-c.dtsi"
 
 / {
 	compatible = "tplink,archer-c5-v1", "qca,qca9558";

target/linux/ath79/dts/qca9558_tplink_archer-c7-v1.dts

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
 /dts-v1/;
 
-#include "qca9558_tplink_archer-c7.dtsi"
+#include "qca9558_tplink_archer-c.dtsi"
 
 / {
 	compatible = "tplink,archer-c7-v1", "qca,qca9558";

target/linux/ath79/dts/qca9558_tplink_archer-c7-v2.dts

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
 /dts-v1/;
 
-#include "qca9558_tplink_archer-c7.dtsi"
+#include "qca9558_tplink_archer-c.dtsi"
 
 / {
 	compatible = "tplink,archer-c7-v2", "qca,qca9558";