Add FVP build config for Corstone1000

Corstone1000 has two variants -- one for FVP and one for FPGA.
It is controlled by config PLATFORM_IS_FVP.
Update CI build commands to better support Corstone1000.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I9fa690d1179fbc20155fbe7cb8a2fadb86f29580
2 files changed