lua-periphery: fix build on Sparc/Sparc64

Add a patch similar to the one for c-periphery fixing the build on
Sparc and Sparc64 caused by unsupported high baudrates on this
architecture.

Fixes:

  http://autobuild.buildroot.org/results/c2f/c2fd64ed2f17c53a4704284a8281305f97a48169/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>