ARM: dts: renesas: Add RZ/A1 GR-Peach board

Add board code and DTs for Renesas RZ/A1 SoC-based GR-Peach,
which is a cheap development platform with RZ/A1H SoC. The
DTs are imported from Linux 5.0.11, commit d5a2675b207d .

Currently supported are UART, ethernet and RPC SPI. The board
can be booted from RPC SPI by writing the u-boot.bin binary
to the beginning of the SPI NOR, e.g. using the "sf" command.
The board can also be booted via JTAG by setting text base to
0x20020000, loading u-boot.bin there via JTAG and executing it
from that address.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Chris Brandt <chris.brandt@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/grpeach_defconfig b/configs/grpeach_defconfig
new file mode 100644
index 0000000..32254b3
--- /dev/null
+++ b/configs/grpeach_defconfig
@@ -0,0 +1,53 @@
+CONFIG_ARM=y
+# CONFIG_SPL_SYS_THUMB_BUILD is not set
+CONFIG_ARCH_RMOBILE=y
+CONFIG_SYS_TEXT_BASE=0x18000000
+CONFIG_RZA1=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_BOOTDELAY=3
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_HUSH_PARSER=y
+# CONFIG_CMD_ELF is not set
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_SF=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_SNTP=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_MAC_PARTITION=y
+CONFIG_OF_CONTROL=y
+CONFIG_DEFAULT_DEVICE_TREE="r7s72100-gr-peach-u-boot"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_USE_ENV_SPI_BUS=y
+CONFIG_ENV_SPI_BUS=0
+CONFIG_USE_ENV_SPI_CS=y
+CONFIG_ENV_SPI_CS=0
+CONFIG_USE_ENV_SPI_MAX_HZ=y
+CONFIG_ENV_SPI_MAX_HZ=50000000
+CONFIG_USE_ENV_SPI_MODE=y
+CONFIG_ENV_SPI_MODE=0x0
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_DM_GPIO=y
+CONFIG_RZA1_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
+# CONFIG_MMC is not set
+CONFIG_DM_SPI_FLASH=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_MACRONIX=y
+# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
+CONFIG_DM_ETH=y
+CONFIG_SH_ETHER=y
+CONFIG_PINCTRL=y
+CONFIG_SCIF_CONSOLE=y
+CONFIG_SPI=y
+CONFIG_DM_SPI=y
+CONFIG_RENESAS_RPC_SPI=y
+CONFIG_TIMER=y
+CONFIG_RENESAS_OSTM_TIMER=y
+CONFIG_OF_LIBFDT_OVERLAY=y
+# CONFIG_EFI_LOADER is not set