drivers/i2c: Move wrapper that implements I2C_WRITEREAD using I2C_transfer from pc9555.c to a new, comon i2c directory

PCA9555 I/O expander:  Fix an error in addressing noted by Stefan Kolb; convert to use I2C_TRANSFER instead of I2C_WRITEREAD which is not thread safe

Add some utilities to support 64-bit math operations on platforms that do not support long long types.  Not yet used anywhere

All SPI-based device drivers needs to call SPI_HWFEATURES() with zero in order to co-exist with drivers that use H/W features

If there is no active connection (e.g. it is waiting in accept), then
the connection object, which doesn't yet exist, should not be cleaned
up when the socket is closed.