Add NBGL support for Stax and Flex #76

Job	Run time
Run static analysis for cargo-ledger	1m 40s
Build SDK	1m 47s
Run static analysis (nanos, include_gif)	1m 18s
Check code formatting	1m 16s
Run static analysis (nanos, testmacro)	1m 17s
Build SDK (nanos)	1m 18s
Run static analysis (nanos, ledger_secure_sdk_sys)	1m 19s
Run unit and integration tests (nanos)	1m 15s
Build SDK (nanox)	1m 18s
Run unit and integration tests (nanox)	1m 17s
Run static analysis (nanos, ledger_device_sdk)	1m 17s
Build SDK (nanosplus)	1m 15s
Run static analysis (nanox, include_gif)	1m 19s
Run unit and integration tests (nanosplus)	1m 19s
Run static analysis (nanox, testmacro)	1m 17s
Run static analysis (nanox, ledger_secure_sdk_sys)	1m 17s
Run static analysis (nanox, ledger_device_sdk)	1m 19s
Run static analysis (nanosplus, include_gif)	1m 18s
Run static analysis (nanosplus, testmacro)	1m 17s
Run static analysis (nanosplus, ledger_secure_sdk_sys)	1m 19s
Run static analysis (nanosplus, ledger_device_sdk)	1m 18s
	28m 0s

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