screencap: Nix deprecated direct read of framebuffer.

screencap command had a fallback path that tried to read the framebuffer
directly. This is no longer supported (and is blocked by selinux
policy), so delete said path.

BUG:27598623
Change-Id: I1b002d4a68ad93f75b150029d01b5f0c500be56c
1 file changed