lm32_juart: Relocate and tidy header

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 93ad19d..82ca5fb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -80,6 +80,7 @@
 S: Maintained
 F: target-lm32/
 F: hw/lm32/
+F: hw/char/lm32_*
 
 M68K
 M: Paul Brook <paul@codesourcery.com>