nxp: cot using nxp internal and mbedtls

Chain of trust(CoT) is enabled on NXP SoC in two ways:
- Using MbedTLS, parsing X509 Certificates.
- Using NXP internal method parsing CSF header

Signed-off-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: I78fb28516dfcfa667bebf8a1951ffb24bcab8de4
13 files changed