spi: drop unneeded spi.h header include from spinand.h

Drop unneeded spi.h header include from spinand.h, nothing included by
spi.h is actually used in this header and .c should correctly included
spi.h if actually needed.

Replace spi.h with linux/bitops.h as this is what is actually required
for spinand.h

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 13b5a52..6fe6fd5 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -17,7 +17,7 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/spi-mem.h>
 #else
-#include <spi.h>
+#include <linux/bitops.h>
 #include <spi-mem.h>
 #include <linux/mtd/nand.h>
 #endif