git-mailrc: add patman and buildman alias

It's easier to Cc Simon on patches related to Patman or Buildman.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/doc/git-mailrc b/doc/git-mailrc
index 70405f2..0fba100 100644
--- a/doc/git-mailrc
+++ b/doc/git-mailrc
@@ -119,3 +119,5 @@
 alias spi	     uboot, jagan
 alias usb            uboot, marex
 alias video          uboot, ag
+alias patman         uboot, sjg
+alias buildman       uboot, sjg