ec/google/chromeec/ec_commands.h: Include stdint.h

This file use stdint types, but does not include the appropriate
header. This creates a parasitic dependency on including stdint.h
before ec_commands.h. Fix that by including the necesarry header.

Change-Id: I52477028c4ba8f6ffad0356c09e5fad4972649ed
Signed-off-by: Alexandru Gagniuc <alexandrux.gagniuc@intel.com>
Reviewed-on: https://review.coreboot.org/14589
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/ec/google/chromeec/ec_commands.h

@@ -346,6 +346,8 @@
  */
 #ifndef __ACPI__
 
+#include <stdint.h>
+
 /*
  * Define __packed if someone hasn't beat us to it.  Linux kernel style
  * checking prefers __packed over __attribute__((packed)).