rp2/Makefile: Add mbedtls to GIT_SUBMODULES list and use it in CI func.

Signed-off-by: Damien George <damien@micropython.org>

ports/rp2/Makefile

@@ -25,7 +25,7 @@ all:
 clean:
 	$(RM) -rf $(BUILD)
 
-GIT_SUBMODULES += lib/pico-sdk lib/tinyusb
+GIT_SUBMODULES += lib/mbedtls lib/pico-sdk lib/tinyusb
 
 submodules:
 	$(MAKE) -f ../../py/mkrules.mk GIT_SUBMODULES="$(GIT_SUBMODULES)" submodules

tools/ci.sh

@@ -256,7 +256,7 @@ function ci_rp2_setup {
 
 function ci_rp2_build {
     make ${MAKEOPTS} -C mpy-cross
-    git submodule update --init lib/mbedtls lib/pico-sdk lib/tinyusb
+    make ${MAKEOPTS} -C ports/rp2 submodules
     make ${MAKEOPTS} -C ports/rp2
     make ${MAKEOPTS} -C ports/rp2 clean
     make ${MAKEOPTS} -C ports/rp2 USER_C_MODULES=../../examples/usercmodule/micropython.cmake