Remove CUBLAS decomposition tests without pivoting.

[maleadt]

After looking into this with @andreasnoack, it turns out that with NoPivot errors quickly accumulate:

using LinearAlgebra
using CUDA
using Test
using Random

m = 3
B = 1
elty = Float32

A = [Float32[0.6079158 0.62611455 0.012768269; 0.61469626 0.6331439 0.42760158; 0.959462 0.3199075 0.31573468]]
As = 1
# move to device
d_A = CuArray{elty, 2}[]
for i in 1:length(A)
    push!(d_A,CuArray(A[i]))
end
pivot, info = CUBLAS.getrf_batched!(d_A, false)
h_info = Array(info)

pivot = NoPivot()
C   = lu!(copy(A[As]), pivot)
h_A = Array(d_A[As])

#reconstruct L,U
dL = Matrix(one(elty)*I, m, m)
dU = zeros(elty,(m,m))
k = h_info[As]
if k >= 0
    dL += tril(h_A,-k-1)
    dU += triu(h_A,k)
end

#compare
@test C.L ≈ dL
@test C.U ≈ dU

julia> C.L
3×3 Matrix{Float32}:
 1.0           0.0  0.0
 1.01115       1.0  0.0
 1.57828  -14541.9  1.0

julia> dL
3×3 Matrix{Float32}:
 1.0           0.0  0.0
 1.01115       1.0  0.0
 1.57828  -14547.8  1.0

[codecov]

Codecov Report

Merging #1246 (2ccc93e) into master (303d4ff) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1246      +/-   ##
==========================================
- Coverage   80.11%   80.09%   -0.03%     
==========================================
  Files         119      119              
  Lines        8404     8404              
==========================================
- Hits         6733     6731       -2     
- Misses       1671     1673       +2     

Impacted Files	Coverage Δ
lib/cublas/wrappers.jl	92.34% <0.00%> (-0.23%)	⬇️

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