ath79: rename Mikrotik RB 922UAGS-5HPacD mtd partition

In RouterBOARD parlance there never was an "art" partition.
This partition has always been named 'hard_config' on ar71xx.

This partition contains more than just ART (Atheros Radio Test) data. It
includes the hardware description (product code, serial, board
identifier, name, hardware options, MAC address), as well as other bits
affecting the operation of RouterBoot.
To avoid confusion with regular ART data, this partition is renamed in
line with historical ar71xx and ramips nomenclature as 'hard_config'.

Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
[minor commit title/message adjustments]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/qca9558_mikrotik_routerboard-922uags-5hpacd.dts

@@ -80,7 +80,7 @@
 &eth0 {
 	status = "okay";
 
-	mtd-mac-address = <&art 0x10>;
+	mtd-mac-address = <&hard_config 0x10>;
 	phy-handle = <&phy4>;
 	pll-data = <0x8f000000 0xa0000101 0xa0001313>;
 
@@ -109,8 +109,8 @@
 				read-only;
 			};
 
-			art: partition@c000 {
-				label = "art";
+			hard_config: partition@c000 {
+				label = "hard_config";
 				reg = <0x000c000 0x0001000>;
 				read-only;
 			};

target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/11-ath10k-caldata

@@ -18,7 +18,7 @@ case "$FIRMWARE" in
 "ath10k/cal-pci-0000:01:00.0.bin")
 	case $board in
 	mikrotik,routerboard-922uags-5hpacd)
-		mikrotik_caldata_extract "art" 0x5000 0x844
+		mikrotik_caldata_extract "hard_config" 0x5000 0x844
 		;;
 	esac
 	;;