msm: clock-8960: Fix clock names for audio_slimbus_clk and pmem_clk on 8064

The device name for audio_slimbus_clk is empty string which results in
slimbus driver failed to get the clock while use a non-empty string as
device name when call clk_get. So change the device name back to NULL
for audio_slimbus_clk in clk lookup table.

The clock name and device name of pmem_clk don't match the name used in
sps driver to get the pmem_clk. Therefore, fix the names in the clk lookup
table.

Change-Id: If58c71a02cd45cd9b9e826608ed20d10d4bb9ac2
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>