Add traxmem helpers

[erhankur]

• Add Xtensa TRAX memory helpers to be used in the AppTrace module of the OpenOCD stub.
• Add soc_utils.h private to the library codes.
• Add bit_utils.h public to the library and client codes.

Will be merged after #11

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[erhankur]

@antmak structure is close to your suggestion now. soc_utils.h taken from the #9 PTAL

[antmak]

LGTM, thank you Erhan!

[antmak]

.