fix u-boot builds
In upstream openembedded-core, the definition for the B variable moved from
u-boot.inc to u-boot-common.inc. None of the recipes in this layer use
upstream's u-boot-common.inc, so add the B to the *common* include files here
so u-boot continues to build. See:
http://cgit.openembedded.org/openembedded-core/commit/meta/recipes-bsp/u-boot?h=master-next&id=
26023b6b0f897842fd98b3e10a8acd5b3ad8f418
This was build-tested with all the imx and ls* lx* MACHINES:
$ MACHINE=<machine> bitbake virtual/bootloader -c compile
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
