firmware: cs_dsp: Fix OOB memory read access in KUnit test (ctl cache)

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: firmware: cs_dsp: Fix OOB memory read access in KUnit test (ctl cache) KASAN reported out of bounds access - cs_dsp_ctl_cache_init_multiple_offsets(). The code uses mock_coeff_template.length_bytes (4 bytes) for register value allocations. But later, this length is set to 8 bytes which causes test code failures. As fix, just remove the lenght override, keeping the original value 4 for all operations.

References

• https://git.kernel.org/stable/c/e3dafc64b90546eb769f33333afabd9e3e915757
• https://git.kernel.org/stable/c/f4ba2ea57da51d616b689c4b8826c517ff5a8523