avr32: Use the generic bitops headers

The generic bitops headers are required when calling logarithmic
functions, such as ilog2().
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>

arch/avr32/include/asm/bitops.h

@@ -6,4 +6,9 @@
 #ifndef __ASM_AVR32_BITOPS_H
 #define __ASM_AVR32_BITOPS_H
 
+#include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/__fls.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/__ffs.h>
+
 #endif /* __ASM_AVR32_BITOPS_H */