corstone700: correct file name in MISRA script.

As corstone700 platform has two build configs, fvp and fpga, update the
MISRA script accordingly.

Change-Id: Ifa4700c95482f3e1f0fd423a86827de14286ccc2
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
1 file changed