coreinfo: add -Os flag

[Jordan Crouse]

Following on the previous patch for libpayload, this adds -Os to the
Makefile for coreinfo, saving more room in the final .elf.

[Uwe Hermann]

On Wed, Mar 19, 2008 at 06:29:17PM -0600, Jordan Crouse wrote:
> coreinfo:  Add -Os to the CFLAGS for size improvements
>
> Signed-off-by: Jordan Crouse

Thanks, r3176.

Uwe.