fp5280g2: Fix the file extra path error

When built the related SDK on fp5280g2, since the wrong FILESEXTRAPATHS
were defined and the build failed.

Tested: built successfully on fp5280g2 using related SDK.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I57cc72ec2eb1d977bd91933573dc4aa4b30cb1e0
1 file changed