[meta-freescale] how to pull down specific version of file after dylan in dylan build

[Ashwin Kirpalani]

I built yocto dylan (fsl-image-gui) but I need to pull down a file in
linux-boundary kernel that was updated after the dylan release. I used the
standard repo instruction to build dylan. The file I need is :
https://raw.github.com/boundarydevices/linux-imx6/64d473f4fab89d52b062bbf8263927be5438b90c/drivers/media/video/mxc/capture/ov5642.c

What command should I run to pull down this file in my current dylan build?
And how do I revert if I want to undo it?

Thanks
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