crypto: octeontx2 - remove CONFIG_DM_CRYPT check

In the Linux kernel, the following vulnerability has been resolved:

crypto: octeontx2 - remove CONFIG_DM_CRYPT check

No issues were found while using the driver with dm-crypt enabled. So

CONFIG_DM_CRYPT check in the driver can be removed.

This also fixes the NULL pointer dereference in driver release if

CONFIG_DM_CRYPT is enabled.

...

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008

...

Call trace:

crypto_unregister_alg+0x68/0xfc

crypto_unregister_skciphers+0x44/0x60

otx2_cpt_crypto_exit+0x100/0x1a0

otx2_cptvf_remove+0xf8/0x200

pci_device_remove+0x3c/0xd4

__device_release_driver+0x188/0x234

device_release_driver+0x2c/0x4c

...