MdePkg has a more refined implementation of Fdt as compared to the EmbeddedPkg which was the initial implementation, hence moving the Fdt Guid from EmbeddedPkg to MdePkg. Continuous-integration-options: PatchCheck.ignore-multi-package Signed-off-by: Akshay Behl <cap2k4@rivosinc.com> Co-authored-by: Dhaval Sharma <dhaval@rivosinc.com>