Adds both rpi.gpio and periphery as deps

* For Buster, rpi.gpio exists for upstream Debian which means it is
there for Dev Board users.
* Since Dev board users need periphery, install both on all platforms
and let the enviro python code use the correct library.

Change-Id: Iaa421854c929f63f50c998bf843df71ab3166a1a
1 file changed