memory: renesas-rpc-if: Add RZ/G2 to Kconfig description

The Renesas RPC-IF is present on the RZ/G2 Series.  Add that to
the description.
Suggested-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210102115412.3402059-2-aford173@gmail.comSigned-off-by: Krzysztof Kozlowski <krzk@kernel.org>

drivers/memory/Kconfig

@@ -202,9 +202,9 @@ config RENESAS_RPCIF
 	depends on ARCH_RENESAS || COMPILE_TEST
 	select REGMAP_MMIO
 	help
-	  This supports Renesas R-Car Gen3 RPC-IF which provides either SPI
-	  host or HyperFlash. You'll have to select individual components
-	  under the corresponding menu.
+	  This supports Renesas R-Car Gen3 or RZ/G2 RPC-IF which provides
+	  either SPI host or HyperFlash. You'll have to select individual
+	  components under the corresponding menu.
 
 config STM32_FMC2_EBI
 	tristate "Support for FMC2 External Bus Interface on STM32MP SoCs"