OMAP4 powerdomain: Fix pwrsts flags for ALWAYS ON domains

The pwrsts flag for ALWAYS ON domains like always_on_core_pwrdm
and wkup_pwrdm is wrongly populated with the define for a
powerdomain power state, instead of the allowable state
bitfields.
This causes a few api's to fail sensing invalid pwrst
requested.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>