blackfin: Disable CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED in some cases

The boards do not link for me due to exceeding their size constrains, change
the config so they fit again.

Cc: Sonic Zhang <sonic.adi@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
6 files changed