MAINTAINERS: update mail address for NVDIMM

My Intel mail account will be disabled soon, update the mail info
to my private mail

Signed-off-by: Xiao Guangrong <xiaoguangrong.eric@gmail.com>
Message-Id: <1490074437-17059-1-git-send-email-guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2dbb9ec..57f4efd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1131,7 +1131,7 @@
 F: docs/specs/rocker.txt
 
 NVDIMM
-M: Xiao Guangrong <guangrong.xiao@linux.intel.com>
+M: Xiao Guangrong <xiaoguangrong.eric@gmail.com>
 S: Maintained
 F: hw/acpi/nvdimm.c
 F: hw/mem/nvdimm.c