mbedtls: Fix component Makefile

components/mbedtls/Makefile

@@ -1,14 +1,8 @@
 #
 # Component Makefile
-#
-# This Makefile should, at the very least, just include $(SDK_PATH)/Makefile. By default, 
-# this will take the sources in this directory, compile them and link them into 
-# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
-# please read the SDK documents if you need to do this.
-#
 
 COMPONENT_SRCDIRS := library port
 
 EXTRA_CFLAGS += -DMBEDTLS_CONFIG_FILE='"mbedtls/esp_config.h"'
 
-include $(SDK_PATH)/Makefile
+include $(IDF_PATH)/make/component.mk