linuxi-qoriq-sdk: add p1010rdb and p2020rdb to compatible machines

lockdown kernel sources to tarball version for p2020rdb and p1010rdb by
adding them to compatible machines of kernel and kernel headers recipe.

Signed-off-by: Fahad Usman <fahad_usman@mentor.com>
Merge pull request #303 from fahadusman/async-2

linuxi-qoriq-sdk: add p1010rdb and p2020rdb to compatible machines