dt-bindings: clock: r9a06g032-sysctrl: Change maintainer to Fabrizio Castro

Gareth no longer works for Renesas.
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
Acked-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Link: https://lore.kernel.org/r/20230426100925.12063-1-chris.paterson2@renesas.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.yaml

@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: Renesas RZ/N1D (R9A06G032) System Controller
 
 maintainers:
-  - Gareth Williams <gareth.williams.jx@renesas.com>
+  - Fabrizio Castro <fabrizio.castro.jz@renesas.com>
   - Geert Uytterhoeven <geert+renesas@glider.be>
 
 properties: