[mlir][tosa] Require PadOp's pad_const to be rank1 (#129156)
Update PadOp's pad_const input to be rank1.
Fix various lit tests for this change including some conv ops
Signed-off-by: Jerry Ge <jerry.ge@arm.com>
Signed-off-by: Tai Ly <tai.ly@arm.com>
Co-authored-by: Tai Ly <tai.ly@arm.com>