crypto_test: get stats in milliseconds
crypto_test: get stats in milliseconds

Along with ticks, print in milliseconds as well.
Use PRIu32 specifier for compiler compatibility.

Signed-off-by: Naveen Kaje <79e427f88b1293e6ef90566b3bd0a85565336125@juul.com>

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core