stm32: move stm32 specific code to mach-stm32

This patch moves stm32 sources at one place, with this armv7m now contains
only generic stuff.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
diff --git a/arch/arm/mach-stm32/Kconfig b/arch/arm/mach-stm32/Kconfig
new file mode 100644
index 0000000..7dbeb04
--- /dev/null
+++ b/arch/arm/mach-stm32/Kconfig
@@ -0,0 +1,12 @@
+if STM32
+
+config STM32F4
+	bool "stm32f4 family"
+
+config STM32F1
+	bool "stm32f1 family"
+
+source "arch/arm/mach-stm32/stm32f4/Kconfig"
+source "arch/arm/mach-stm32/stm32f1/Kconfig"
+
+endif