Fails in compilation of rpmsg application

[AnandSingh]

Below is the error message.

| echo_test.c:26:25: fatal error: linux/rpmsg.h: No such file or directory
| #include <linux/rpmsg.h>
| ^
| compilation terminated.
| Makefile:17: recipe for target 'echo_test.o' failed
| make: *** [echo_test.o] Error 1
| WARNING: exit code 1 from a shell command.

[wjliang]

You will need to enable RPMsg in Linux kernel as this example uses RPMsg in kernel space implementation