[xla] remove BorrowingLiteral constructor for LiteralProto
[xla] remove BorrowingLiteral constructor for LiteralProto

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10759 from Intel-tensorflow:akhil/gemv 4534fbd7e96a6e45ccc5a501b38b940aa8bd9d38
