Use explicit type for pcu_lsb()

It's only used for byte-long input so we can specify input and output
types explicitly.

Change-Id: Id0bef691e17e4331c7c4b491661e36173d85388a

src/pcu_utils.h

@@ -44,8 +44,7 @@ inline unsigned int pcu_bitcount(T x)
 	return count;
 }
 
-template <typename T>
-inline T pcu_lsb(T x)
+inline uint8_t pcu_lsb(uint8_t x)
 {
 	return x & -x;
 }