[meta-freescale] [meta-freesclae] Replace/change/append SRC_URI for kernel git URL.

[Janis Coders]

Hi, I am trying to append SRC_URI of linux-imx_2.6.35.3.bb recipe, 
because we have our own git repository. The problem is that I don't want 
to override the SRC_URI completely, but only change the git repo address 
to our server. Does Yocto support it in some pretty way? (because for 
now we have to use this regex syntax in .bbapend file, which works, but 
isn't pretty):

NEW_SRC_URI = "git://X.X.X.X/git/be-kernel.git;protocol=git;branch=yyyyyyy"
TMP_SRC_URI := '${@bb.utils.re.sub("git://[^\\s]*", 
d.getVar("NEW_SRC_URI", True), d.getVar("SRC_URI", True))}'
SRC_URI_mx5 = "${TMP_SRC_URI}"