Pass unit name to soc node to fix the following W=1 build warning:

arch/arm64/boot/dts/freescale/s32g2.dtsi:82.6-123.4: Warning (unit_address_vs_reg): /soc: node has a reg or ranges property, but no unit name
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Chester Lin <clin@suse.com>
Signed-off-by: Chester Lin <clin@suse.com>
Link: https://lore.kernel.org/r/20220514143505.1554813-1-festevam@gmail.com