cxl/cxl-event: include missing <linux/types.h> and <linux/uuid.h>

cxl/cxl-event: include missing <linux/types.h> and <linux/uuid.h>

The linux/cxl-event.h header file uses the u8, u16, and uuid_t types,
but it doesn't include the necessary header files,
<linux/types.h> and <linux/uuid.h>.

Currently, cxl-event.h is only used by drivers/cxl/cxlmem.h,
and it doesn't cause any errors because cxlmem.h indirectly
includes the required types.

However, cxl-event.h may be used by other CXL-related code in the future,
so it's important to fix this issue by including the missing header files
directly in cxl-event.h.

Signed-off-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20240417035043.2791431-1-sangyun.kim@snu.ac.kr
Signed-off-by: Dave Jiang <dave.jiang@intel.com>