zephyrCommon: Implement random and randomSeed

- Using zephyr random api
- Using a stub for randomSeed since it is not present in Zephyr

Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>

cores/arduino/zephyrCommon.cpp

@@ -328,3 +328,23 @@ void detachInterrupt(pin_size_t pinNumber)
 {
   setInterruptHandler(pinNumber, nullptr);
 }
+
+#ifndef CONFIG_RNG_GENERATOR_CHOICE
+
+#include <zephyr/random/random.h>
+
+void randomSeed(unsigned long) {}
+
+long random(long min, long max) {
+	long temp;
+
+	sys_rand_get(&temp, sizeof(temp));
+
+	return temp % (max - min) + min;
+}
+
+long random(long max) {
+	return random(0, max);
+}
+
+#endif