platform/x86: thinkpad_acpi: Take hotkey_mutex during hotkey_exit()

hotkey_exit() already takes the mutex around the hotkey_poll_stop_sync()
call, but not around the other calls.

commit 38831eaf7d4c ("platform/x86: thinkpad_acpi: use lockdep
annotations") has added lockdep_assert_held() checks to various hotkey
functions.

These lockdep_assert_held() checks fail causing WARN() backtraces in
dmesg due to missing locking in hotkey_exit(), fix this.

Fixes: 38831eaf7d4c ("platform/x86: thinkpad_acpi: use lockdep annotations")
Tested-by: Mark Pearson <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Reviewed-by: Mark Pearson <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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