fix i2c read buffer overrun

If a client requests data beyond the end of the coretest response,
i2c_core could wait forever for txd_syn to be asserted, locking up the
system. The current solution is to assume that data will be available
by the time the client sends the READ_CMD and then issues the i2c read
request; if no data is available, i2c_core returns 0x00. Given the
relative speeds of the i2c bus and the FPGA, this seems justifiable,
but it could use more scrutiny.

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