mbedtls: update kconfig help to correct on supported MPI bits
@@ -276,7 +276,7 @@ menu "mbedTLS"
Enable hardware accelerated multiple precision integer operations.
Hardware accelerated multiplication, modulo multiplication,
- and modular exponentiation for up to 4096 bit results.
+ and modular exponentiation for up to SOC_RSA_MAX_BIT_LEN bit results.
These operations are used by RSA.
