soc: imx93: a55: add missing stdint header

Without sdtint.h in soc.h, compiling failure might occur in
some cases.

Signed-off-by: Winteri Wang <dongjie.wang@nxp.com>
diff --git a/soc/nxp/imx/imx9/imx93/a55/soc.h b/soc/nxp/imx/imx9/imx93/a55/soc.h
index 84db820..a4c936a 100644
--- a/soc/nxp/imx/imx9/imx93/a55/soc.h
+++ b/soc/nxp/imx/imx9/imx93/a55/soc.h
@@ -7,6 +7,8 @@
 #ifndef _SOC_NXP_IMX_IMX93_A55_SOC_H_
 #define _SOC_NXP_IMX_IMX93_A55_SOC_H_
 
+#include <stdint.h>
+
 uint32_t common_clock_set_freq(uint32_t clock_name, uint32_t rate);
 
 #endif /* _SOC_NXP_IMX_IMX93_A55_SOC_H_ */