stm32: add support for the STM32L031G6U6

targets/stm32l031x6.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+  FLASH_TEXT (rx) : ORIGIN = 0x08000000, LENGTH = 32K
+  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 8K
+}
+
+_stack_size = 2K;
+
+INCLUDE "targets/arm.ld"

targets/stm32l0x1.json

@@ -0,0 +1,18 @@
+{
+    "inherits": [
+        "cortex-m0plus"
+    ],
+    "build-tags": [
+        "stm32l031",
+        "stm32l0x1",
+        "stm32l0",
+        "stm32"
+    ],
+    "linkerscript": "targets/stm32l031x6.ld",
+    "extra-files": [
+        "src/device/stm32/stm32l0x1.s"
+    ],
+    "flash-method": "openocd",
+    "openocd-interface": "cmsis-dap",
+    "openocd-target": "stm32l0"
+}