Add missing changelog entry
Add missing changelog entry

Add missing changelog entry for 3698: Mark basic constraints critical
as appropriate.

Signed-off-by: Dave Rodgman <c7ff43d67af1dd23561452e7410f0b0fcc98e527@arm.com>

ARMmbed/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls