spi: Drop mismerged fix

One patch of a series of three that was sent fixing issues with the
ppc4xx driver was targeted at -next, unfortunately it being sandwiched
between two others that targeted mainline tripped up my workflow and
caused it to get merged along with the others.  The ppc4xx driver is
only buildable in very limited configurations so none of the CI catches
issues with it.

Fixes: de4af897

 ("spi: ppc4xx: Fix fallout from rename in struct spi_bitbang")
Signed-off-by: Mark Brown <broonie@kernel.org>