plat: qti: Fix build failure

Fixed build failure due to the commit:905f93c77 by removing
the inclusion of non-existent 'stdinit.h' file.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I8e3ca69c016b7a2354c58c4d384a492631c36286
diff --git a/plat/qti/common/src/qti_rng.c b/plat/qti/common/src/qti_rng.c
index a904209..f63f3b8 100644
--- a/plat/qti/common/src/qti_rng.c
+++ b/plat/qti/common/src/qti_rng.c
@@ -4,10 +4,10 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 #include <stddef.h>
-#include <stdint.h>
 
 #include <lib/mmio.h>
 
+#include <qti_rng.h>
 #include <qti_rng_io.h>
 
 int qti_rng_get_data(uint8_t *out, uint32_t out_len)