ARM: OMAP4: PM: Adapt the existing OMAP2/3 and common Power Domain Frameworks.

Taking care of the platform specific and common power domains with
proper checks.  Also refining some Macros according to the latest
OMAP4 requirements.

Signed-off-by: Abhijit Pagare <abhijitpagare@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>