i2c: designware: Move interrupt handling functions before i2c_dw_xfer()

Code is more logically arranged when i2c_dw_read_clear_intrbits() and
i2c_dw_isr() are located before i2c_dw_xfer().

Real reason for this is to prepare for more shared code between
interrupt and polling mode code.

While at it, remove one extra space and refer to the
i2c_dw_init_master() in two comment sections.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Jiawen Wu <jiawenwu@trustnetic.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

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