utils: Add BIT_32 and BIT_64 macros

When applying some MISRA rules, lots of issues are raised with BIT macro
on AARCH32, and cast on uint32_t would be required (Rule 10.3).
The macros BIT_32 and BIT_64 are then created for 32bit and 64bit.
Then the BIT macro defaults on BIT_64 on AARCH64,
and on BIT_32 on AARCH32.
Signed-off-by: Yann Gautier <yann.gautier@st.com>

include/lib/utils_def.h

@@ -16,7 +16,14 @@
 
 #define SIZE_FROM_LOG2_WORDS(n)		(4 << (n))
 
-#define BIT(nr)				(ULL(1) << (nr))
+#define BIT_32(nr)			(U(1) << (nr))
+#define BIT_64(nr)			(ULL(1) << (nr))
+
+#ifdef AARCH32
+#define BIT				BIT_32
+#else
+#define BIT				BIT_64
+#endif
 
 /*
  * Create a contiguous bitmask starting at bit position @l and ending at