Add the support for X64 compilation to the CI. Fix the compilation errors. Cc: Pierre Gondois <pierre.gondois@arm.com> Cc: Sami Mujawar <sami.mujawar@arm.com> Signed-off-by: Abdul Lateef Attar <AbdulLateef.Attar@amd.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>