[U-Boot] MAKEALL build error on usb/master branch

Hi Marek

I thought you might like to be aware of this error, if not already known.

Thanks Troy

/u-boot-imx6/LOG$ cat mx28evk.ERR mxsimage.c:18:25: fatal error: openssl/evp.h: No such file or directory compilation terminated. make[1]: *** [mxsimage.o] Error 1 make[1]: *** Waiting for unfinished jobs.... make[1]: *** wait: No child processes. Stop. make: *** [tools] Error 2