Remove redundant definitions

Author: devmotion

src/generics.jl

@@ -2,9 +2,6 @@
 
 ## Basic functions
 
-Base.eltype(a::AbstractPDMat{T}) where {T<:Real} = T
-Base.eltype(::Type{AbstractPDMat{T}}) where {T<:Real} = T
-Base.ndims(a::AbstractPDMat) = 2
 Base.size(a::AbstractPDMat) = (dim(a), dim(a))
 Base.size(a::AbstractPDMat, i::Integer) = 1 <= i <= 2 ? dim(a) : 1
 Base.length(a::AbstractPDMat) = abs2(dim(a))