add support for Seeed solar panel (#6597)

* add seeed_solar_node

* fix RF_SW problem

* fix IIC problem

* Update Button redefination

* Add on-board flash pin defination

* fix missing a ','

* update seeed sorlar panel defination

* fix word spell

* fix upstream change

* fix upstream change

* fix upstream change

* fix formate

* Restore the FLASH definition that was deleted by mistake and pull down the CS pin to ensure low power consumption

* fix led defination conflict

* Delete lib/device-ui directory

* Restore protobufs submodule

---------

Co-authored-by: WayenWeng <jinyuan.weng@seeed.cc>

variants/Seeed_Solar_Node/platformio.ini

@@ -0,0 +1,14 @@
+[env:Seeed_Solar_Node]
+board = Seeed_Solar_Node
+extends = nrf52840_base
+;board_level = extra
+build_flags = ${nrf52840_base.build_flags} 
+  -I $PROJECT_DIR/variants/Seeed_Solar_Node 
+  -D SEEED_SOLAR_NODE 
+  -Isrc/platform/nrf52/softdevice -Isrc/platform/nrf52/softdevice/nrf52
+  -L "${platformio.libdeps_dir}/${this.__env__}/bsec2/src/cortex-m4/fpv4-sp-d16-hard"
+board_build.ldscript = src/platform/nrf52/nrf52840_s140_v7.ld
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/Seeed_Solar_Node>
+lib_deps =
+  ${nrf52840_base.lib_deps}
+debug_tool = jlink