feeds: add mcu feed with 'umcumgr' package

The 'umcumgr' is a simple command line tool for MCU firmware management
over MCUmgr/SMP protocol. It will be used together with MCUboot running
on the on-board (or external, e.g. in form of a dongle) MCU.

While at it, add also dedicated 'mcu.yml' profile file.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

feeds/mcu/umcumgr/Makefile

@@ -0,0 +1,43 @@
+#
+# Copyright (C) 2023 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=umcumgr
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://gitlab.com/pepe2k/umcumgr
+PKG_SOURCE_DATE:=2023-03-06
+PKG_SOURCE_VERSION:=966606a2868b8e6b0a2c7e129dc45a30e0d9ef87
+
+PKG_LICENSE:=Apache-2.0
+PKG_LICENSE_FILES:=
+
+PKG_MAINTAINER:=Piotr Dymacz <pepe2k@gmail.com>
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+CMAKE_INSTALL:=1
+
+define Package/umcumgr
+  SECTION:=utils
+  CATEGORY:=Utilities
+  DEPENDS:=+libubox
+  TITLE:=User space tool for MCUmgr SMP based management
+endef
+
+define Package/umcumgr/description
+  Simple user space tool for MCU management over MCUmgr SMP
+  (Simple Management Protocol) protocol
+endef
+
+define Package/umcumgr/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/umcumgr $(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,umcumgr))

profiles/mcu.yml

@@ -0,0 +1,8 @@
+---
+description: Add MCU support related dependencies
+feeds:
+  - name: mcu
+    path: ../../feeds/mcu
+
+packages:
+  - umcumgr