Refactor examples/tpm_io into separate platform source files

[tomoveu]

This is the crude work, now remains the details in automake and testing

• tpm_io_atmel.c contains only ASF code

• tpm_io_barebox.c contains only code for Barebox

• tpm_io_st.c to contain only STM32 specific code

• tpm_io_linux.c to contain only Linux specific code

• tpm_io_qnx includes the new QNX callback

• tpm_io_xilinx.c to contain only Xilinx code

• Noted that native Linux /dev/tpmX does not require an IO callback

• TPM Simulator and Windows TBS also does not require an IO callback

Signed-off-by: Dimitar Tomov dimi@wolfssl.com

[dgarske]

@tomoveu also looks like you will need to add all tpmio[platform].c files to all the examples _SOURCES.

[dgarske]

@tomoveu . Also with --enable-swtpm get issue with #define TPM2_IoCb NULL and function in tpm_io.c conflicting.

examples/tpm_io.c:170:5: error: expected ')'
int TPM2_IoCb(TPM2_CTX* ctx, const byte* txBuf, byte* rxBuf,

[tomoveu]

@dgarske Oh, thanks! Good points.

I thought automake could include the correct tpm_io_platform.c at compile time?

Thus, include.am would require only tpm_io.c/.h Hm, I may have overestimated how versatile automake is.

[tomoveu]

1. Kept single tpm_io.h for backward compatibility
2. Updated all example include.am files to include every supported tpm_io platform
3. Fixed missing ifdefs for TPM Simulator case

TPM Simulator and Native Linux are working. I am testing STM32 right now.

@elms could you please quickly run the native tests for the Windows port?

@dgarske could you please help test QNX, Xilinx and Atmel ASF?

[elms]

@tomoveu Testing on Windows looks like it operates the same as master.