include/public: Use uint32_t instead of unsigned (int)

include/public: Use uint32_t instead of unsigned (int)

Public interfaces shall make use of types that indicate size and
signedness. Take the opportunity to also modify places where explicit
unsigned int is used.

Signed-off-by: Michal Orzel <michal.orzel@arm.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>