i3c: dw: Create a generic fifo read function
In a future change we'll want to read from the IBI FIFO too, so turn dw_i3c_read_rx_fifo() into a generic read with the FIFO register as a parameter. Signed-off-by:Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by:
Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/827204789583dd86addffb47ecaeab9d67cf95d5.1680161823.git.jk@codeconstruct.com.auSigned-off-by:
Alexandre Belloni <alexandre.belloni@bootlin.com>
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