Add generic px4 interface for crypto features

Add common functions, implemented for nuttx, and link to architecture specific libraries

Make a separate library to wrap nuttx random number generator as "os_random".

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

platforms/nuttx/src/px4/common/px4_init.cpp

@@ -52,6 +52,10 @@
 # include <nuttx/i2c/i2c_master.h>
 #endif // CONFIG_I2C
 
+#if defined(PX4_CRYPTO)
+#include <px4_platform_common/crypto.h>
+#endif
+
 int px4_platform_init()
 {
 
@@ -70,6 +74,10 @@ int px4_platform_init()
 		close(fd_buf);
 	}
 
+#if defined(PX4_CRYPTO)
+	PX4Crypto::px4_crypto_init();
+#endif
+
 	hrt_init();
 
 	param_init();