bmips: add subtargets for each SoC

BMIPS is a generic arch that can be used for multiple Broadcom SoCs, each one
with its own specific drivers, so instead of having a huge kernel supporting
all of them, let's switch to a subtarget per SoC like other OpenWrt targets.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bmips/bcm6358/base-files/etc/board.d/01_leds

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+. /lib/functions/leds.sh
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+case "$(board_name)" in
+huawei,hg556a-b)
+	ucidef_set_led_usbport "usb" "USB" "red:hspa" "1-1-port1" "1-1-port2" "usb1-port2" "usb2-port2"
+	;;
+esac
+
+board_config_flush
+
+exit 0

target/linux/bmips/bcm6358/base-files/etc/board.d/02_network

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+case "$(board_name)" in
+huawei,hg556a-b)
+	ucidef_set_interface_lan "eth0"
+	;;
+esac
+
+board_config_flush
+
+exit 0

target/linux/bmips/bcm6358/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+PART_NAME=firmware
+REQUIRE_IMAGE_METADATA=1
+
+platform_check_image() {
+	return 0
+}
+
+platform_do_upgrade() {
+	case "$(board_name)" in
+	*)
+		default_do_upgrade "$1"
+		;;
+	esac
+}