Morello ELF specification has misleading R_MORELLO_(I)RELATIVE definitions

[jrtc27]

Currently these are both given as CAP_INIT(S, A, CAP_SIZE, CAP_PERM), but that does not make sense. Both always have a null symbol and the image base load offset needs to be added in. For R_MORELLO_IRELATIVE it also needs Indirect(...) around it (or an explicit capability version).