vendor: Upgrade CMSIS from 4.5.0 to 5.7.0

[concatime]

CMSIS 4 is a legacy version and as @whoenig told me in #708 (comment):

I don't see a reason for not upgrading CMSIS.

The only difference I found in code between CMSIS 4 and 5 is that the latter offers two versions of arm_bitreversal2:
https://github.com/ARM-software/CMSIS/blob/master/CMSIS/DSP_Lib/Source/TransformFunctions/arm_bitreversal2.S
https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.S
https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c

The Makefile would automatically pick the C version when the target is solely DSP_OBJ += arm_bitreversal2.o: https://github.com/bitcraze/crazyflie-firmware/blob/master/tools/make/cmsis_dsp/obj.mk#L273. That’s why CSFLAGS is not required anymore. I removed __TARGET_FPU_VFP like #709. I also removed the unused includes $(CRAZYFLIE_BASE)/src/utils/interface/clockCorrection and $(CRAZYFLIE_BASE)/src. Finally, I sorted the targets.

With #713 and this, this repo. would be buildable with Clang.

I need reviews of this PR.
Thank you in advance.

[concatime]

There is something off with the CI. I have no issues on my end.

UPDATE: make unit fails in my machine too. Working on it.

[ataffanel]

Looks good to me! i had to run git submodule sync to be able to pull the new submodule, but except for that everything work including the unit tests.

The PR is still marked [WIP] but if you have nothing to add to it, I can merge it.

[concatime]

I was waiting for #714 to get merged. All conflits are now resolved.

[ataffanel]

Merging, thanks!