ASoC: topology: Fix memory corruption in soc_tplg_denum_create_values()

The allocation uses sizeof(u32) when it should use sizeof(unsigned long)
so it leads to memory corruption later in the function when the data is
initialized.

Fixes: 5aebe7c7

 ("ASoC: topology: fix endianness issues")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YAf+8QZoOv+ct526@mwanda
Signed-off-by: Mark Brown <broonie@kernel.org>