arm64/debug_console: Add basic functionality to puts call

* Matches arm and riscv64

Change-Id: I88874df4da16f5019def0c0c79ca41f37a926c12
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4916
Reviewed-by: <[email protected]>
Reviewed-by: Alex von Gluck IV <[email protected]>

src/system/kernel/arch/arm64/arch_debug_console.cpp

@@ -59,6 +59,15 @@ arch_debug_serial_putchar(const char c)
 void
 arch_debug_serial_puts(const char *s)
 {
+	while (*s != '\0') {
+		char ch = *s;
+		if (ch == '\n') {
+			arch_debug_serial_putchar('\r');
+			arch_debug_serial_putchar('\n');
+		} else if (ch != '\r')
+			arch_debug_serial_putchar(ch);
+		s++;
+	}
 }