Build: Disable FP related configs on CS300

There is a known issue in TF-M related to FP build on CS300. Disable
these configs to unblock CI nightly job.

This patch should be reverted once the issue got fixed.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I7d613947b0b66a78b2d705230c14ba868e2ed750
1 file changed