ARM: dts: at91: rename sama7g5ek.dts to at91-sama7g5ek.dts

In Linux this DT file is named at91-sama7g5ek.dts. Rename it accordingly.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index beaaf15..1c2de0a 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1046,7 +1046,7 @@
 	omap5-uevm.dtb
 
 dtb-$(CONFIG_TARGET_SAMA7G5EK) += \
-	sama7g5ek.dtb
+	at91-sama7g5ek.dtb
 
 dtb-$(CONFIG_TARGET_SAMA5D2_PTC_EK) += \
 	at91-sama5d2_ptc_ek.dtb