MTB_ADV_WISE_1570: disable MPU code until target properly supported

[juhoeskeli]

Description

The target started HardFaulting since the MPU overhaul commit (1821d37). This was visible in cloud connectivity tests. This is a workaround which disables the MPU code for the target. A proper fix would be target specific routines.

Pull request type

[ ] Fix
[ ] Refactor
[X] Target update
[ ] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

[juhoeskeli]

@0xc0170 @kjbracey-arm please take a look

[kjbracey]

Will need to chase up a proper fix, of course. Create GitHub tracking issue for that?

(Wondering if maybe we could arrange a build warning for devices with MPU off, just to stop this sort of workaround being totally forgotten...)

[juhoeskeli]

Found the actual bug and created PR for that: #8946

In case that is OK maybe we can close down this one.

[0xc0170]

@juhoeskeli Thanks 👍

[cmonr]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 4 of 4 test jobs passed
Build number : 1
Build artifacts
Build logs

[juhoeskeli]

@cmonr we don't actually need this in master anymore as #8946 fixed the problem. Do you want a new PR to re-enable the feature or how should it be done?

[cmonr]

@juhoeskeli Ah, neat.

I think the best thing to do would be to make a branch that reverts this PR, then submit that PR. We can take it from there.