Utilize layer-specific bbappends

This silences the bbappend warnings.

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
(cherry picked from commit 923f9428ec800892cebbb52fb6925a3fa2451ebc)
linux-imx: catch up with upstream update to 3.0.35

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
(cherry picked from commit b0853efc6595705e6fdacc2a6993909647a10bf3)
linux-{imx,qoriq-sdk,omap4}: add missing SRC_URI separator

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
(cherry picked from commit 5fe66d3e86c175de9fff072f858e317d7223b59f)