linux-imx

ARM: pxa: add dummy clock for pxa25x and pxa27x

gpio-pxa driver is shared among arch-pxa and arch-mmp. Clock is the
essential component on pxa3xx/pxa95x and arch-mmp. So we need to
define dummy clock in pxa25x/pxa27x instead.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>