arm64/sysreg: Directly include bitfield.h

The SYS_FIELD_ macros in sysreg.h use definitions from bitfield.h but there
is no direct inclusion of it, add one to ensure that sysreg.h is directly
usable.

Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: broonie

arch/arm64/include/asm/sysreg.h

@@ -1116,6 +1116,7 @@
 
 #else
 
+#include <linux/bitfield.h>
 #include <linux/build_bug.h>
 #include <linux/types.h>
 #include <asm/alternative.h>