Delete obsolete sdhci-pxa.c, which was previously shared amongst the
entire PXA series.  Instead we now use sdhci-pxav3.c for mmp2 and
sdhci-pxav2.c for pxa9xx.
Signed-off-by: NZhangfei Gao <zhangfei.gao@marvell.com>
Acked-by: NPhilip Rakity <prakity@marvell.com>
Acked-by: NMark F. Brown <mark.brown314@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>