Merge branch 'topic/vadim/cortexm' into 'master'

Fix selection of floating point support packages for `light-cortex-m*`

Closes #67

See merge request eng/toolchain/bb-runtimes!103

arm/cortexm.py

@@ -1282,6 +1282,10 @@ class CortexM3(ArmV7MTarget):
     def name(self):
         return "cortex-m3"
 
+    @property
+    def has_single_precision_fpu(self):
+        return False
+
     @property
     def has_fpu(self):
         return True
@@ -1305,6 +1309,10 @@ class CortexM4(ArmV7MTarget):
     def name(self):
         return "cortex-m4"
 
+    @property
+    def has_single_precision_fpu(self):
+        return False
+
     @property
     def has_fpu(self):
         return True
@@ -1328,6 +1336,10 @@ class CortexM4F(CortexM4):
     def name(self):
         return "cortex-m4f"
 
+    @property
+    def has_single_precision_fpu(self):
+        return True
+
     @property
     def compiler_switches(self):
         # The required compiler switches
@@ -1374,6 +1386,10 @@ class CortexM7DF(CortexM7F):
     def name(self):
         return "cortex-m7df"
 
+    @property
+    def has_double_precision_fpu(self):
+        return True
+
     @property
     def compiler_switches(self):
         # The required compiler switches