Made the efm32 targets use the common makefile template

The prior implementation of the efm32 makefile templates used a custom version of the bin diretory creation.
My version has a few advantages:
1. the targets are always forced into bin.
   this is different from the old style, where any custom rules might polute the project root directory
2. smaller templates
3. fewer total templates

Author: theotherjimmy

workspace_tools/export/gcc_arm_efm32_common.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}

workspace_tools/export/gcc_arm_efm32gg_stk3700.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}

workspace_tools/export/gcc_arm_efm32hg_stk3400.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}

workspace_tools/export/gcc_arm_efm32lg_stk3600.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}

workspace_tools/export/gcc_arm_efm32pg_stk3401.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}

workspace_tools/export/gcc_arm_efm32wg_stk3800.tmpl

@@ -1 +1,8 @@
-{% extends "gcc_arm_efm32_common.tmpl" %}
+{% extends "gcc_arm_common.tmpl" %}
+
+{% block target_project_elf %} {{ super() }}	@echo ""
+	@echo "*****"
+	@echo "***** You must modify vector checksum value in *.bin and *.hex files."
+	@echo "*****"
+	@echo ""
+{%- endblock %}