[SYCL][NFC] Add clang-format configuration file for SYCL LIT tests (#1224)

By default LLVM style limit code lines size to 80 characters. It should
not be applied to LIT tests as clang-format can't preserve LIT commands
semantic written in the code comments.

This configuration file was shamelessly copied from the clang project.

Signed-off-by: Alexey Bader <alexey.bader@intel.com>

Author: bader

sycl/test/.clang-format

@@ -0,0 +1,2 @@
+BasedOnStyle: LLVM
+ColumnLimit: 0