Revert "Delete ExSDRAM.scf"

This reverts commit db4790f60a57b0b8bd76e7317c08b845f823f186.
Revert "Delete ChipFlash.scf"

This reverts commit 836c4ce5515b2673af17055d3b2e20a7dbead7e3.
Revert "Delete ExFlash.scf"

This reverts commit dfd6fc121f60c0e9ba56bc52105dcfc5ff442a0a.