at91: add support for sama7g5-ek board

Add support for SAMA7G5-EK board.
Hardware:
- SoC: SAMA7G5
- RAM: Aliance Memory AS4C256M16D3LC (4 Gbit DDR3L)
- SD/MMC: 1 standard 4bit SD Card interface
- USB: 1 Micro-AB host/device, 1 Type-A host, 1 Type-C host
- CAN: 2 interfaces
- Ethernet: 10/100 port, 1Gbps port
- Wi-Fi/BT: 1 optional interface
- Audio: 1 SPDIF RX port, 1 SPDIF TX port, 4 digital microphones
- Camera: 1 RPi CSI camera interface
- Debug: 1 J-Link-OB + CDC, 1 JTAG
- LEDs: 1 RGB
- Buttons: 4 push buttons
- Expansions: 1 RPi Expansion connector, 2 mikroBUS connectors
- Power management: 1 power management IC, 1 power consumption
  measurement device

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

package/boot/at91bootstrap/Makefile

@@ -172,6 +172,12 @@ define AT91Bootstrap/sama5d2_ptc_eksd_uboot
   BUILD_DEVICES:=microchip_sama5d2-ptc-ek
 endef
 
+define AT91Bootstrap/sama7g5eksd_uboot
+  TITLE:=AT91Bootstrap for SAMA7G5-EK (SDCard)
+  BUILD_SUBTARGET:=sama7
+  BUILD_DEVICES:=microchip_sama7g5-ek
+endef
+
 AT91BOOTSTRAP_TARGETS := \
 	at91sam9x5eknf_uboot \
 	at91sam9x5eksd_uboot \
@@ -192,7 +198,8 @@ AT91BOOTSTRAP_TARGETS := \
 	sama5d27_wlsom1_eksd_uboot \
 	sama5d27_wlsom1_ekdf_qspi_uboot \
 	sama5d2_ptc_eknf_uboot \
-	sama5d2_ptc_eksd_uboot
+	sama5d2_ptc_eksd_uboot \
+	sama7g5eksd_uboot
 
 define Build/Compile
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \

package/boot/uboot-at91/Makefile

@@ -143,6 +143,12 @@ define U-Boot/sama5d2_ptc_ek_mmc
   BUILD_DEVICES:=microchip_sama5d2-ptc-ek
 endef
 
+define U-Boot/sama7g5ek_mmc1
+  NAME:=SAMA7G5-EK (SDCard)
+  BUILD_SUBTARGET:=sama7
+  BUILD_DEVICES:=microchip_sama7g5-ek
+endef
+
 UBOOT_TARGETS := \
 	at91sam9m10g45ek_nandflash \
 	at91sam9x5ek_nandflash \
@@ -162,7 +168,8 @@ UBOOT_TARGETS := \
 	sama5d27_wlsom1_ek_mmc \
 	sama5d27_wlsom1_ek_qspiflash \
 	sama5d2_ptc_ek_nandflash \
-	sama5d2_ptc_ek_mmc
+	sama5d2_ptc_ek_mmc \
+	sama7g5ek_mmc1
 
 define Build/Compile
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \