backports: Actually export the 2.6.34 sdio compat symbols

sdio_get_host_pm_caps() and sdio_set_host_pm_flags() were defined
in compat-2.6.34 but not actually exported for other modules to use.

The cw1200 driver needs sdio_set_host_pm_flags() properly exported.

Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>