git-mailrc: add rockchip alias

It's easier to Cc rockchip maintainers on rockchip-releated patches.

Signed-off-by: jk <jk.kernel@gmail.com>
diff --git a/doc/git-mailrc b/doc/git-mailrc
index 1d6f4fc..8f0724f 100644
--- a/doc/git-mailrc
+++ b/doc/git-mailrc
@@ -76,7 +76,7 @@
 alias ti             uboot, trini
 alias uniphier       uboot, masahiro
 alias zynq           uboot, monstr
-
+alias rockchip       uboot, sjg, Lin huang <hl@rock-chips.com>
 alias avr32          uboot, abiessmann
 
 alias bfin           uboot, vapier, sonic