build system: Refactor component.mk to not need component_common.mk

New makefile component_wrapper.mk allows some variables to be set
before component.mk is evaluated. This properly fixes problems with
sdkconfig being hard to access in all phases of the build.

Including component_common.mk is no longer necessary and will print a
deprecation warning for components which use it.

components/esp32/component.mk

@@ -1,12 +1,6 @@
 #
 # Component Makefile
 #
-# This Makefile should, at the very least, just include $(IDF_PATH)/make/component_common.mk. 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 esp-idf build system document if you need to do this.
-#
--include include/config/auto.conf
 
 COMPONENT_SRCDIRS := . hwcrypto
 
@@ -21,8 +15,6 @@ COMPONENT_ADD_LDFLAGS := -lesp32 \
                           -L $(COMPONENT_PATH)/ld \
                           $(LINKER_SCRIPTS)
 
-include $(IDF_PATH)/make/component_common.mk
-
 ALL_LIB_FILES := $(patsubst %,$(COMPONENT_PATH)/lib/lib%.a,$(LIBS))
 
 # automatically trigger a git submodule update
@@ -44,8 +36,6 @@ $(COMPONENT_LIBRARY): $(ALL_LIB_FILES)
 # saves us from having to add the target to a Makefile.projbuild
 $(COMPONENT_LIBRARY): esp32_out.ld
 
-# .. is BUILD_DIR_BASE here, as component makefiles
-# are evaluated with CWD=component build dir
 esp32_out.ld: $(COMPONENT_PATH)/ld/esp32.ld ../include/sdkconfig.h
 	$(CC) -I ../include -C -P -x c -E $< -o $@