Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] wa

Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] was used to double check the license matching
code in the Python script. All the licenses detected by scancode are
either detected by spdxify.py, or have no SPDX identifier, or are false
matches.

Link: [1] https://spdx.org/licenses/
Link: [2] https://github.com/jforissier/misc/blob/f7b56c8/spdxify.py
Link: [3] https://github.com/nexB/scancode-toolkit
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>

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Import zlib v1.2.11

Import the decompression code from zlib v1.2.11. From the project's
README:

"zlib 1.2.11 is a general purpose data compression library. [...] The
data format used by the zlib li

Import zlib v1.2.11

Import the decompression code from zlib v1.2.11. From the project's
README:

"zlib 1.2.11 is a general purpose data compression library. [...] The
data format used by the zlib library is described by RFCs (Request for
Comments) 1950 to 1952 in the files rfc1950 (zlib format), rfc1951
(deflate format) and rfc1952 (gzip format)."

This code will be used in a later commit to decompress early TAs.
Only the inflate() function is needed, and the library is configured
without gzip support. The source files that are not required
for inflate() are left aside.

The library is licensed under a permissive license, see `zlib.h`.

Link: http://tools.ietf.org/html/rfc1950
Link: http://tools.ietf.org/html/rfc1951
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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