tcg/sparc64: Rename from tcg/sparc

Emphasize that we only support full 64-bit code generation.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index c41d8d6..62bbbba 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3370,7 +3370,7 @@
 
 SPARC TCG target
 S: Odd Fixes
-F: tcg/sparc/
+F: tcg/sparc64/
 F: disas/sparc.c
 
 TCI TCG target