Revert "scripts/gdb: bail early if there are no generic PD"

This reverts commit 30ac77e9 which is
commit f19c3c2959e465209ade1a7a699e6cbf4359ce78 upstream.

It is not needed in Android systems, and it breaks the ABI for no real
reason, so revert it.

Bug: 161946584
Change-Id: I96195afffc4e2bb06d16b6489548b4b475b6599c
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>