sandbox: Correctly define BITS_PER_LONG

SANDBOX_BITS_PER_LONG is the number of bits in long on the sandbox
platform.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
diff --git a/arch/sandbox/include/asm/types.h b/arch/sandbox/include/asm/types.h
index c1a5d2a..5f4b649 100644
--- a/arch/sandbox/include/asm/types.h
+++ b/arch/sandbox/include/asm/types.h
@@ -18,11 +18,7 @@
 /*
  * Number of bits in a C 'long' on this architecture.
  */
-#ifdef	CONFIG_PHYS_64BIT
-#define BITS_PER_LONG 64
-#else	/* CONFIG_PHYS_64BIT */
-#define BITS_PER_LONG 32
-#endif	/* CONFIG_PHYS_64BIT */
+#define BITS_PER_LONG CONFIG_SANDBOX_BITS_PER_LONG
 
 #ifdef	CONFIG_PHYS_64BIT
 typedef unsigned long long dma_addr_t;