lib: identity_key: CONFIG_IDENTITY_KEY no longer requires ASSERT

[jonaias]

The ASSERT statements were removed on commit (ae41289), but the KConfig was never updated.

In our current build, ASSERT increases ROM size by about 10%. It would be nice if, in the next SDK version, we didn't need to patch the library to fix it.

Before patch

Memory region         Used Size  Region Size  %age Used
           FLASH:      507028 B     962048 B     52.70%
             RAM:      311132 B       440 KB     69.05%
        IDT_LIST:          0 GB        32 KB      0.00%

After patch

Memory region         Used Size  Region Size  %age Used
           FLASH:      457156 B     962048 B     47.52%
             RAM:      310864 B       440 KB     69.00%
        IDT_LIST:          0 GB        32 KB      0.00%

Work sponsored by Limitless.ai

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