u80211_drv: port over rtl8188eu driver

kernel-src/io/net/u80211_drv/src/string.c

@@ -0,0 +1,23 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#include <u80211_drv/string.h>
+
+void *u80211_drv_memcpy(void *destination, const void *source, size_t size) {
+	uint8_t *destination_bytes = destination;
+	const uint8_t *source_bytes = source;
+
+	for (size_t i = 0; i < size; ++i)
+		destination_bytes[i] = source_bytes[i];
+
+	return destination;
+}
+
+void *u80211_drv_memset(void *destination, int value, size_t size) {
+	uint8_t *destination_bytes = destination;
+
+	for (size_t i = 0; i < size; ++i)
+		destination_bytes[i] = (uint8_t)value;
+
+	return destination;
+}