misc: nsm: remove selecting the non-existing config CBOR

Commit b9873755a6c8 ("misc: Add Nitro Secure Module driver") adds Nitro
Security Module support, which selects the non-existing config CBOR.

In the development of the commit, there was initially some code for CBOR
independent of the driver, and the driver included this code with the line
'select CBOR'. This code for CBOR was later reduced to its bare minimum of
functionality and included into the driver itself. The select CBOR remained
unnoticed and was left behind without having any further purpose.

Remove selecting the non-existing config CBOR.

Signed-off-by: Lukas Bulwahn <[e-mail]>
Reviewed-by: Alexander Graf <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/Kconfig

···
 	tristate "Nitro (Enclaves) Security Module support"
 	depends on VIRTIO
 	select HW_RANDOM
-	select CBOR
 	help
 	  This driver provides support for the Nitro Security Module
 	  in AWS EC2 Nitro based Enclaves. The driver exposes a /dev/nsm