perf/arm_cspmu: Fix missing io.h include

Adding the writel() calls needs io.h, which apparently gets
transiently included somewhere on arm64, but not elsewhere.

Fixes: 6de0298 ("perf/arm_cspmu: Generalise event filtering")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/657935ca177024ad08d5ec6f85e8faf75f82cf65.1742212833.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <[email protected]>

Author: rmurphy-arm

drivers/perf/arm_cspmu/nvidia_cspmu.c

@@ -6,6 +6,7 @@
 
 /* Support for NVIDIA specific attributes. */
 
+#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/topology.h>