Building the library without entropy sources negates any and all security
provided by the library.
This option was originally requested a relatively long time ago and it
does not provide any tangible benefit for users any more.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
`entropy_poll.h` is not supposed to be used by application code and
is therefore being made internal.
Signed-off-by: Chris Jones <christopher.jones@arm.com>