board: at91: sama7g54_curiosity: Add initial board support

Add initial support for SAMA7G54 Curiosity board.

Hardware:
SoC: SAMA7G54D2G SiP 1000 MHz
DRAM: DDR3 256 MiB
PMIC: MCP16502
Debug: UART3
Flash: QSPI NOR 8 MiB, SLC NAND 512 MiB
M.2 slot for wireless
Mikrobus connectors x 2
SD-Card connectors x 1
USB 2.0 x 3

Signed-off-by: Mihai Sain <mihai.sain@microchip.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index c5fd869..8a8ac53 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -286,6 +286,15 @@
        select BOARD_EARLY_INIT_F
        select BOARD_LATE_INIT
 
+config TARGET_SAMA7G54_CURIOSITY
+	bool "SAMA7G54 CURIOSITY board"
+	select SAMA7G5
+	select CPU_V7A
+	help
+	  The SAMA7G54 Curiosity embeds SAMA7G54D2G SiP (System in Package)
+	  with 2Gbit DDR3-SDRAM, 64Mbit QSPI nor-flash with MAC-address,
+	  4Gbit SLC nand-flash, MCP16502 PMIC, 2 x Mikrobus connectors,
+	  1 x SD-Card connector, 1 x M.2 slot, 3 x USB
 
 config TARGET_TAURUS
 	bool "Support taurus"
@@ -366,6 +375,7 @@
 source "board/atmel/sam9x60ek/Kconfig"
 source "board/atmel/sam9x60_curiosity/Kconfig"
 source "board/atmel/sama7g5ek/Kconfig"
+source "board/atmel/sama7g54_curiosity/Kconfig"
 source "board/atmel/sama5d2_ptc_ek/Kconfig"
 source "board/atmel/sama5d2_xplained/Kconfig"
 source "board/atmel/sama5d27_som1_ek/Kconfig"