ARM: pxa: sharpsl pm needs SPI

The sharpsl code selects the max1111 spi driver, so it must also
ensure that SPI itself is enabled. The platform does not work
without max1111.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>