fix LSI clock value for Arch Max (STM32F407)

Author: xiongyihui

workspace_tools/targets.py

@@ -630,6 +630,7 @@ def __init__(self):
         self.extra_labels = ['STM', 'STM32F4', 'STM32F407', 'STM32F407VG']
         self.supported_toolchains = ["ARM", "uARM", "GCC_ARM"]
         self.supported_form_factors = ["ARDUINO"]
+        self.macros = ['LSI_VALUE=32000']
 
     def program_cycle_s(self):
         return 2