RTEMS | bsps/shared/: fix pedantic warnings for SPIN_DECLARE (!1058)

[Bhuvan B (@BhuvanB404)]

Bhuvan B created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1058

Project:Branches: BhuvanB404/rtems:pedantic-warning to rtems/rtos/rtems:main
Author:   Bhuvan B



## Summary

bsps/shared/: fix pedantic warnings for SPIN_DECLARE

Updated the files: 

```
gr1553bc.c
gr1553bm.c
gr1553rt.c
ahbstat.c
grcan_internal.h
occan.c
gr_701.c
gr_rasta_adcdac.c
gr_rasta_io.c
gr_rasta_spw_router.c
gr_rasta_tmtc.c
gr_tmtc_1553.c
grpci2dma.c
grspw_pkt.c
spwtdp.c
grtc.c
grtm.c
gr_cpci_gr740.c
gr_leon4_n2x.c
```

I am a bit confused on how other pendantic errors should be handled. Suggestions are  really appreciated. 

Fixes #5483

## Generative AI

no

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