Rename generic armsoc files from omap_ to armsoc_

None of the files that contain the filename omap_ are OMAP specific
but are instead generic armsoc files. This commit renames the files
to make it more clear that the armsoc is a generic ARM ddx driver.

Change-Id: I600fa4b3bdebffc7e5b57f8ad535edce5f2555cf
11 files changed