[ARM] 5203/1: i2c-pxa: fix scheduling while atomic in i2c_pxa_abort()

i2c_pxa_abort can be called from the atomic context.
Change it to use mdelay and counted loop.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>