[ARM] 5071/2: Drop PXA_SHARPSL_25x/27x case from PXA Kconfig.

As nothing in the code references to the PXA_SHARPSL_25x/27x,
we can drop that Kconfig case and permit all-zaurus builds.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>