Use SoC ID - based detection in CESA

[mw_semihalf.com]

Summary

This commit introduces following changes in order to get rid of
ifdef's from all around the driver.

• Introduce sc_soc_id field in cesa_softc structure - this value is obtained in cesa_attach() anyway, so make use of it.
• Replace ifdefs with SoC ID checks.
• Perform PM control status only for relevant SoC's.

[zbb]

sys/dev/cesa/cesa.c

1204

Found it! Style ;-)

[mw_semihalf.com]

Fix style in one of assignments.