`SpiNorFlash.h` is a C++ header, but the `Identification` struct is
created in a C style using `typedef struct`. Clang issues a warining
about this discrepancy:
```
In file included from /home/nero/repos/pinetime/InfiniSim/InfiniTime/src/systemtask/SystemTask.cpp:13:
/home/nero/repos/pinetime/InfiniSim/sim/drivers/SpiNorFlash.h:16:21: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
typedef struct __attribute__((packed)) {
^
Identification
/home/nero/repos/pinetime/InfiniSim/sim/drivers/SpiNorFlash.h:17:9: note: type is not C-compatible due to this default member initializer
uint8_t manufacturer = 0;
^~~~~~~~~~~~~~~~~~~~
/home/nero/repos/pinetime/InfiniSim/sim/drivers/SpiNorFlash.h:20:9: note: type is given name 'Identification' for linkage purposes by this typedef declaration
} Identification;
^
1 warning generated.
```
The easy fix is to use a C++ style struct.
Same fix as in: https://github.com/InfiniTimeOrg/InfiniTime/pull/1046
