build_optee: add new build flags
These new flags are necessary for vts keymaster tests:
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CFG_HMAC_64_1024_RANGE : set HMAC key size ranges between 64 and 1024 bits as required by vts keymaster test.
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CFG_TA_OPTEE_CORE_API_COMPAT_1_1 : use Internal Core API v1.1
Signed-off-by: Safae Ouajih souajih@baylibre.com