Update Zephyr to v2.7.0

Author: valeros

boards/disco_h735ig.json

@@ -0,0 +1,46 @@
+{
+  "build": {
+    "cpu": "cortex-m7",
+    "extra_flags": "-DSTM32H7xx -DSTM32H735xx",
+    "f_cpu": "550000000L",
+    "mcu": "stm32h735igk6u",
+    "product_line": "STM32H735xx",
+    "zephyr": {
+       "variant": "stm32h735g_disco"
+    }
+  },
+  "connectivity": [
+    "can",
+    "ethernet"
+  ],
+  "debug": {
+    "default_tools": [
+      "stlink"
+    ],
+    "jlink_device": "STM32H735IG",
+    "onboard_tools": [
+      "stlink"
+    ],
+    "openocd_target": "stm32h7x",
+    "svd_path": "STM32H73x.svd"
+  },
+  "frameworks": [
+    "stm32cube",
+    "zephyr"
+  ],
+  "name": "STM32H735G-DK Discovery kit",
+  "upload": {
+    "maximum_ram_size": 442368,
+    "maximum_size": 1048576,
+    "protocol": "stlink",
+    "protocols": [
+      "blackmagic",
+      "cmsis-dap",
+      "jlink",
+      "stlink",
+      "mbed"
+    ]
+  },
+  "url": "https://www.st.com/en/evaluation-tools/stm32h735g-dk.html",
+  "vendor": "ST"
+}

boards/nucleo_f446ze.json

@@ -25,7 +25,8 @@
     "cmsis",
     "mbed",
     "stm32cube",
-    "libopencm3"
+    "libopencm3",
+    "zephyr"
   ],
   "name": "ST Nucleo F446ZE",
   "upload": {

examples/zephyr-blink/zephyr/prj.conf

@@ -1,2 +1 @@
-CONFIG_GPIO=y
-CONFIG_SERIAL=n
+# nothing here

examples/zephyr-subsys-usb-hid-mouse/zephyr/prj.conf

@@ -1,4 +1,3 @@
-CONFIG_USB=y
 CONFIG_USB_DEVICE_STACK=y
 CONFIG_USB_DEVICE_HID=y
 CONFIG_USB_DEVICE_PRODUCT="Zephyr HID mouse sample"

platform.json

@@ -300,7 +300,7 @@
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~2.20600.0"
+      "version": "~2.20700.0"
     },
     "tool-stm32duino": {
       "type": "uploader",
@@ -329,7 +329,7 @@
     "tool-cmake": {
       "optional": true,
       "owner": "platformio",
-      "version": "~3.16.0"
+      "version": "~3.21.0"
     },
     "tool-dtc": {
       "optional": true,