tg3: Add more selfboot formats to NVRAM selftest

tg3: Add more selfboot formats to NVRAM selftest

This patch adds more selfboot formats to the NVRAM selftest.  It also
changes the code to return an error on an unsupported NVRAM format.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>
(cherry picked from commit 727a6d9f39604b5592e474295960fceeb523ae4f)

Signed-off-by: Joe Jin <joe.jin@oracle.com>