ARM: renesas: Fix R-Car spelling

The correct spelling is R-Car, including the dash, update the usage.
Kconfig strings and comment changes only, no functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/arch/arm/mach-renesas/memmap-gen3.c b/arch/arm/mach-renesas/memmap-gen3.c
index c50700d..d24419f 100644
--- a/arch/arm/mach-renesas/memmap-gen3.c
+++ b/arch/arm/mach-renesas/memmap-gen3.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Renesas RCar Gen3 memory map tables
+ * Renesas R-Car Gen3 memory map tables
  *
  * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
  */