ssb: sprom: fix block comments coding style issues

Fixed coding style issues

Signed-off-by: John Oldman <john.oldman@polehill.co.uk>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200424175043.16261-1-john.oldman@polehill.co.uk