sunxi: improve throughput in the sunxi_mmc driver

sunxi: improve throughput in the sunxi_mmc driver

Throughput tests have shown the sunxi_mmc driver to take over 10s to
read 10MB from a fast eMMC device due to excessive delays in polling
loops.

This commit restructures the main polling loops to use get_timer(...)
to determine whether a (millisecond) timeout has expired.  We choose
not to use the wait_bit function, as we don't need interruptability
with ctrl-c and have at least one case where two bits (one for an
error condition and another one for completion) need to be read and
using wait_bit would have not added to the clarity.

The observed speedup in testing on a A31 is greater than 10x (e.g. a
10MB write decreases from 9.302s to 0.884s).

Signed-off-by: Philipp Tomsich <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Tested-by: Mylène Josserand <[email protected]>
Acked-by: Jagan Teki <[email protected]>
Reviewed-by: Tom Rini <[email protected]>