* Create NV Index for GPIO access right after TPM2_GPIO_Config
* Set and read example to use the NV index created by the config example
* Added instructions about the new gpio examples
* Added vendor check, right now only ST33 supports TPM extra GPIO
* NV Index for GPIO Input requires an extra step, included in gpio/config
* Added sanity check and NV Index delete before new GPIO configuration
* Changes based on peer review
Signed-off-by: Dimitar Tomov <dimi@wolfssl.com>
Dimitar Tomov