Fix inconsistent usage of type and compile error

uint32_t is not defined in linux/types.h and it leads to compilation
error and is inconsistent. Fix it by changing to __u32.

Signed-off-by: Rajasekaran Kalidoss <rajasekaran.kalidoss@arm.com>
Change-Id: Idfb212e241eb161dba0e1e37930df0c869c92358