ASoC: da7213: Initialize the mutex

Initialize the struct da7213_priv::ctrl_lock mutex. Without it the
following stack trace is displayed when rebooting and lockdep is enabled:

DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 180 at kernel/locking/mutex.c:564 __mutex_lock+0x254/0x4e4
CPU: 0 UID: 0 PID: 180 Comm: alsactl Not tainted 6.13.0-next-20250123-arm64-renesas-00002-g132083a22d3d #30
Hardware name: Renesas SMARC EVK version 2 based on r9a08g045s33 (DT)
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mutex_lock+0x254/0x4e4
lr : __mutex_lock+0x254/0x4e4
sp : ffff800082c13c00
x29: ffff800082c13c00 x28: ffff00001002b500 x27: 0000000000000000
x26: 0000000000000000 x25: ffff800080b30db4 x24: 0000000000000002
x23: ffff800082c13c70 x22: 0000ffffc2a68a70 x21: ffff000010348000
x20: 0000000000000000 x19: ffff00000be2e488 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 00000000000003c1 x13: 00000000000003c1 x12: 0000000000000000
x11: 0000000000000011 x10: 0000000000001420 x9 : ffff800082c13a70
x8 : 0000000000000001 x7 : ffff800082c13a50 x6 : ffff800082c139e0
x5 : ffff800082c14000 x4 : ffff800082c13a50 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00001002b500
Call trace:
  __mutex_lock+0x254/0x4e4 (P)
  mutex_lock_nested+0x20/0x28
  da7213_volsw_locked_get+0x34/0x60
  snd_ctl_elem_read+0xbc/0x114
  snd_ctl_ioctl+0x878/0xa70
  __arm64_sys_ioctl+0x94/0xc8
  invoke_syscall+0x44/0x104
  el0_svc_common.constprop.0+0xb4/0xd4
  do_el0_svc+0x18/0x20
  el0_svc+0x3c/0xf0
  el0t_64_sync_handler+0xc0/0xc4
  el0t_64_sync+0x154/0x158
 irq event stamp: 7713
 hardirqs last  enabled at (7713): [<ffff800080170d94>] ktime_get_coarse_real_ts64+0xf0/0x10c
 hardirqs last disabled at (7712): [<ffff800080170d58>] ktime_get_coarse_real_ts64+0xb4/0x10c
 softirqs last  enabled at (7550): [<ffff8000800179d4>] fpsimd_restore_current_state+0x30/0xb8
 softirqs last disabled at (7548): [<ffff8000800179a8>] fpsimd_restore_current_state+0x4/0xb8
 ---[ end trace 0000000000000000 ]---

Fixes: 64c3259b ("ASoC: da7213: Add new kcontrol for tonegen")
Cc: stable@vger.kernel.org
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20250123121036.70406-1-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>