i2c: i2c-qcom-geni: Reinitialize the variables after every transfer

Reinitialize fifo cur_wr, cur_rd and gi2c->xfer for every transfer.
Add "MSM_GPI_QUP_FW_ERROR" event to callback event list. Dump GSI
registers in case of Channel RESET failure.

Change-Id: I7607572c6b70ea46325cce3ff648ee1b70b49fbf
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>