Remove raft math.cuh and matrix.cuh (#7797)

Follow up to #7752. Remove two remaining headers that were supposed to be removed.

Authors:
  - Anupam (https://github.com/aamijar)

Approvers:
  - Simon Adorf (https://github.com/csadorf)

URL: #7797

Author: aamijar

cpp/src_prims/opg/linalg/svd.cu

@@ -11,8 +11,6 @@
 #include <raft/linalg/eig.cuh>
 #include <raft/linalg/gemm.cuh>
 #include <raft/linalg/matrix_vector.cuh>
-#include <raft/matrix/math.cuh>
-#include <raft/matrix/matrix.cuh>
 #include <raft/matrix/reverse.cuh>
 #include <raft/matrix/sqrt.cuh>