linux: Bump to 3.17.4
Radeon: Fix kfree of unitialized ptr - thx to Adam Williamson
imx6: Add coherent_pool=1M to boot options - fixes some dvb cards
Merge pull request #3636 from fritsch/imx-coherent

imx6: Add coherent_pool=1M to boot options - fixes some dvb cards
Merge pull request #3635 from fritsch/radeon-fix

linux: Bump to 3.17.4
v4l-utils: update to v4l-utils-1.6.2

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/imx6/linux: add coherent_pool to kernel config

Signed-off-by: Stephan Raue <stephan@openelec.tv>