[PATCH] arm64: dts: ti: k3-*: fix fss node dtbs check warnings

[reidt]

On 13:48-20230810, Dhruva Gole wrote:
> Fix these fss node warnings that dtbs_check throws:
> 
> fss at 47000000: $nodename:0: 'fss at 47000000' does not match
> '^([a-z][a-z0-9\\-]+-bus|bus|localbus|soc|axi|ahb|apb)(@.+)?$'
> 
> By renaming fss to bus.
> 
> Cc: Nishant Menon <nm at ti.com>
> Suggested-by: Andrew Davis <afd at ti.com>
> Signed-off-by: Dhruva Gole <d-gole at ti.com>
> ---
>
Reviewed-by: Reid Tonking <reidt at ti.com>