iommu/ipmmu-vmsa: Clarify supported platforms

The Renesas IPMMU-VMSA driver supports not just R-Car H2 and M2 SoCs,
but also other R-Car Gen2 and R-Car Gen3 SoCs.

Drop a superfluous "Renesas" while at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -285,8 +285,8 @@ config IPMMU_VMSA
 	select IOMMU_IO_PGTABLE_LPAE
 	select ARM_DMA_USE_IOMMU
 	help
-	  Support for the Renesas VMSA-compatible IPMMU Renesas found in the
-	  R-Mobile APE6 and R-Car H2/M2 SoCs.
+	  Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
+	  APE6, R-Car Gen2, and R-Car Gen3 SoCs.
 
 	  If unsure, say N.