ARM: renesas: Rename ARCH_RMOBILE_BOARD_STRING to ARCH_RENESAS_BOARD_STRING

Rename ARCH_RMOBILE_BOARD_STRING to ARCH_RENESAS_BOARD_STRING
because all the chips are made by Renesas, while only a subset
of them is from the R-Mobile line.

Use the following command to perform the rename:

"
$ git grep -l 'ARCH_RMOBILE_BOARD_STRING' | \
  xargs -I {} sed -i 's@ARCH_RMOBILE_BOARD_STRING@ARCH_RENESAS_BOARD_STRING@g' {}
"

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>
diff --git a/configs/koelsch_defconfig b/configs/koelsch_defconfig
index 8d9c3b9..37511f8 100644
--- a/configs/koelsch_defconfig
+++ b/configs/koelsch_defconfig
@@ -18,7 +18,7 @@
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="r8a7791-koelsch-u-boot"
 CONFIG_SPL_TEXT_BASE=0xe6300000
-CONFIG_ARCH_RMOBILE_BOARD_STRING="Koelsch"
+CONFIG_ARCH_RENESAS_BOARD_STRING="Koelsch"
 CONFIG_R8A7791=y
 CONFIG_TARGET_KOELSCH=y
 CONFIG_SYS_MONITOR_LEN=262144