MAINTAINERS: ARM: SIRF: add the source code tree path

I got an account "baohua" from kernel.org and I'll use this tree
to maintain CSR SoCs stuff:
git://git.kernel.org/pub/scm/linux/kernel/git/baohua/linux.gitSigned-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

MAINTAINERS

@@ -797,6 +797,7 @@ F:	arch/arm/mach-gemini/
 ARM/CSR SIRFPRIMA2 MACHINE SUPPORT
 M:	Barry Song <baohua.song@csr.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/baohua/linux.git
 S:	Maintained
 F:	arch/arm/mach-prima2/
 F:	drivers/dma/sirf-dma.c