powerpc/pseries: Include linux/types.h in papr-platform-dump.h

Fix the following build warning:
usr/include/asm/papr-platform-dump.h:12: found __[us]{8,16,32,64} type without #include <linux/types.h>

Fixes: 8aa9efc0be66 ("powerpc/pseries: Add papr-platform-dump character driver for dump retrieval")
Closes: https://lore.kernel.org/linux-next/[e-mail]/
Reported-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Haren Myneni <[e-mail]>
Tested-by: Venkat Rao Bagalkote <[e-mail]>
[Maddy: fixed the commit to combine tags together]
Signed-off-by: Madhavan Srinivasan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

arch/powerpc/include/uapi/asm/papr-platform-dump.h

···
 #ifndef _UAPI_PAPR_PLATFORM_DUMP_H_
 #define _UAPI_PAPR_PLATFORM_DUMP_H_
 
+#include <linux/types.h>
 #include <asm/ioctl.h>
 #include <asm/papr-miscdev.h>