linux-yocto-rt: update qemuppc support and streamline variables
Fixes [YOCTO #1391]
Fixes [YOCTO #1389]
qemuppc must have a dedicated branch for -rt support, since it has
board specific patches that are not suitable for a common location.
This fixes the boot by propagating some common fixes and by syncing
to the latest meta-configuration.
There are some variables that are now in linux-yocto.inc and need not
be defined by the kernel recipe itself, so we can safely remove them
with no impact on the build.
CC: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
