hv: fix 'No brackets to then/else'

- add missing brackets for 'if/else' statements based on MISRA-C
  requirements

v1 -> v2:
 * add brackets for each conditions in 'if' statements to improve
   the readability
 * modify 'ptdev_init' to make the logic clearer

Tracked-On: #861
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>

hypervisor/include/lib/bits.h

@@ -139,8 +139,9 @@ static inline uint64_t ffz64_ex(const uint64_t *addr, uint64_t size)
 	uint64_t idx;
 
 	for (idx = 0UL; (idx << 6U) < size; idx++) {
-		if (addr[idx] != ~0UL)
+		if (addr[idx] != ~0UL) {
 			return (idx << 6U) + ffz64(addr[idx]);
+		}
 	}
 
 	return size;