for the i2c_3 to work the following is needed to modify the SDK.
nrf/subsys/spm/Kconfig
```
config SPM_NRF_TWIM3_NS
bool "TWIM3 is Non-Secure"
default y
```
and
spm.c
```
#ifdef NRF_TWIM3
PERIPH("NRF_TWIM3", NRF_TWIM3, CONFIG_SPM_NRF_TWIM3_NS),
#endif
```
Can this be added to the stock SDK?
for that matter, other configurations should be added as well, such as SPI 1 etc.. is there a reason this is not added in the SDK?