staging/android: Remove ram_console.h

ram_console is replaced by pstore and pstore_ram drivers,
and there is no code to use this head file, so remove it.

Signed-off-by: Bintian Wang <bintian.wang@huawei.com>
Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>