com: i2c object rename to indicate interface

include/utl/com/i2c.h

@@ -239,7 +239,7 @@ namespace utl {
       {t.write(0, s)}  -> bool;
    };
 #else
-   namespace i2c_t_cnpt {
+   namespace i2c_i_cnpt {
       using std::declval;
 
       template <class _Tp> using try_cfreq_t = decltype (declval<const _Tp>().frequency());
@@ -275,7 +275,7 @@ namespace utl {
     * \return  True if _Tp is a i2c interface
     */
    template <typename _Tp>
-   constexpr bool i2c_c = i2c_t_cnpt::is_i2c_<_Tp>::value;
+   constexpr bool i2c_c = i2c_i_cnpt::is_i2c_<_Tp>::value;
 #endif
 
    //!@}