git-mailrc: add Alexey as ARC maintainer

It's easier to Cc him on ARC-releated patches.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

doc/git-mailrc

@@ -12,6 +12,7 @@ alias u-boot uboot
 # things simple and easy to look up/coordinate.
 alias aaribaud       Albert Aribaud <albert.u.boot@aribaud.net>
 alias abiessmann     Andreas Bießmann <andreas.devel@googlemail.com>
+alias abrodkin       Alexey Brodkin <alexey.brodkin@synopsys.com>
 alias afleming       Andy Fleming <afleming@gmail.com>
 alias ag             Anatolij Gustschin <agust@denx.de>
 alias alisonwang     Alison Wang <alison.wang@freescale.com>
@@ -50,9 +51,11 @@ alias vapier         Mike Frysinger <vapier@gentoo.org>
 alias wd             Wolfgang Denk <wd@denx.de>
 
 # Architecture aliases
-alias arch           arm, avr32, bfin, m68k, microblaze, mips, nds32, nios2, powerpc, sandbox, superh, sparc, x86
+alias arch           arc, arm, avr32, bfin, m68k, microblaze, mips, nds32, nios2, powerpc, sandbox, superh, sparc, x86
 alias arches         arch
 
+alias arc            uboot, abrodkin
+
 alias arm            uboot, aaribaud
 alias at91           uboot, abiessmann
 alias davinci        ti