manifest: Update nRF hw models to latest

Update the HW models module to:
fbc6e614686b69dfa56f9694350b9488cf83d3f7

Including the following:
fbc6e61 HW models: Fix a few Wextra warnings
b164f15 nrfx replacements: Fix a few Wextra warnings
1f02d3b UART 54: Correct UART22 name
3172fdb UART(E): Add new pty backend
3015405 UARTE FIFO backend: Fix comment and typos
c29727a doc: UARTE is now implemented for 54L
64d9cdf 54 UARTE: Add support for Address bit and configurable data size
3745647 UART: FIFO backend ignore irrelevant CONFIG bits
3a20c98 54 UARTE: Add MATCH functionality
bceda1b Int controller: Provide logic similar to SEVONPEND bit
e66584f Makefile: Add variable to pass arbitrary build options

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>