py: Add guarded includes for asm-based headers.

py/asmarm.h

@@ -24,6 +24,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+#ifndef __MICROPY_INCLUDED_PY_ASMARM_H__
+#define __MICROPY_INCLUDED_PY_ASMARM_H__
+
+#include "py/misc.h"
 
 #define ASM_ARM_PASS_COMPUTE (1)
 #define ASM_ARM_PASS_EMIT    (2)
@@ -120,3 +124,4 @@ void asm_arm_bcc_label(asm_arm_t *as, int cond, uint label);
 void asm_arm_b_label(asm_arm_t *as, uint label);
 void asm_arm_bl_ind(asm_arm_t *as, void *fun_ptr, uint fun_id, uint reg_temp);
 
+#endif // __MICROPY_INCLUDED_PY_ASMARM_H__