Change the debugfs directory name from hisi_spi65535 to hisi_spi0.

Fixes: 2b2142f2 ("spi: hisi-kunpeng: Add debugfs support")
Signed-off-by: oujiefeng <oujiefeng@huawei.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/20211117012119.55558-1-f.fangjian@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>