ssb: add some missing sprom attributes

This patch extends the sprom struct to contain all sprom attributes
found in sprom version 1 to 9. This was done accordingly to the open
source part of the Broadcom SDK.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>