config: Define BOOTP client architecture and VCI for ARMv8

Reuse the 32-bit ARM client architecture and identify ARMv8 specifically
by setting the BOOTP VCI string.

Cc: Dennis Gilmore <dennis@ausil.us>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

include/config_distro_defaults.h

@@ -20,10 +20,12 @@
 #define CONFIG_BOOTP_PXE
 #define CONFIG_BOOTP_SUBNETMASK
 
-#if defined(__arm__)
+#if defined(__arm__) || defined(__aarch64__)
 #define CONFIG_BOOTP_PXE_CLIENTARCH     0x100
 #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__)
 #define CONFIG_BOOTP_VCI_STRING         "U-boot.armv7"
+#elif defined(__aarch64__)
+#define CONFIG_BOOTP_VCI_STRING         "U-boot.armv8"
 #else
 #define CONFIG_BOOTP_VCI_STRING         "U-boot.arm"
 #endif