goarch.bbclass: Add loongarch64 to go_map_arch

(From OE-Core rev: 97010a9c1b2bfc7ea01441f37c0682bc5cd4349b)

Signed-off-by: Zang Ruochen <zangruochen@loongson.cn>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/goarch.bbclass

@@ -90,6 +90,8 @@ def go_map_arch(a, d):
         return 'ppc64'
     elif a == 'riscv64':
         return 'riscv64'
+    elif a == 'loongarch64':
+        return 'loong64'
     else:
         raise bb.parse.SkipRecipe("Unsupported CPU architecture: %s" % a)