package/fluent-but: fix symbol name

The symbol for Aarch64 big-endian, as added by 9b19030f3f75
(package/fluent-bit: rework wasm handling), is misspelled.

Fixes: 9b19030f3f75

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/fluent-bit/Config.in

@@ -15,7 +15,7 @@ if BR2_PACKAGE_FLUENT_BIT
 
 config BR2_PACKAGE_FLUENT_BIT_WASM_ARCH
 	string
-	default "AARCH64"    if BR2_aarch64 || BR2_aarch64be
+	default "AARCH64"    if BR2_aarch64 || BR2_aarch64_be
 	default "ARC"        if BR2_arcle || BR2_arceb
 	default "ARM"        if BR2_arm || BR2_armeb
 	default "MIPS"       if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el