Revert "kernel/prism: initial support for GFLT300"

We figured out a way to get real hardware board version detection
working so this commit is no longer necessary.

This reverts commit 5c42569eddd35d5d9c7f6e37e13a73355875dd88

Change-Id: I4b4eaf1d2de2f3bbd4151ddf2e6cb5142b5b5d81
7 files changed