ASoC: SOF: Intel: hda: Use devm_kstrdup() to avoid memleak.

ASoC: SOF: Intel: hda: Use devm_kstrdup() to avoid memleak.

sof_pdata->tplg_filename can have address allocated by kstrdup()
and can be overwritten. Memory leak was detected with kmemleak:

unreferenced object 0xffff88812391ff60 (size 16):
  comm "kworker/4:1", pid 161, jiffies 4294802931
  hex dump (first 16 bytes):
    73 6f 66 2d 68 64 61 2d 67 65 6e 65 72 69 63 00  sof-hda-generic.
  backtrace (crc 4bf1675c):
    __kmalloc_node_track_caller_noprof+0x49c/0x6b0
    kstrdup+0x46/0xc0
    hda_machine_select.cold+0x1de/0x12cf [snd_sof_intel_hda_generic]
    sof_init_environment+0x16f/0xb50 [snd_sof]
    sof_probe_continue+0x45/0x7c0 [snd_sof]
    sof_probe_work+0x1e/0x40 [snd_sof]
    process_one_work+0x894/0x14b0
    worker_thread+0x5e5/0xfb0
    kthread+0x39d/0x760
    ret_from_fork+0x31/0x70
    ret_from_fork_asm+0x1a/0x30

Signed-off-by: Tamura Dai <kirinode0@gmail.com>
Link: https://patch.msgid.link/20250615235548.8591-1-kirinode0@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>