ARM: OMAP2+: first set of hwmod changes for v4.7

For the DRA7xx platform, add IP block data for the McASP, PWMSS,
and GPTimer12 IP blocks.  Add lock and unlock functions for the
RTC IP blocks on the DRA7xx, AM33xx, and AM43xx devices.  And add
a fix for the hwmod core for device driver unbind operations for
IP blocks with hardreset lines.

Basic build, boot, and PM test results are available here:

http://www.pwsan.com/omap/testlogs/omap-hwmod-a-for-v4.7/20160410132119/

Note that the testbed here does not have the DRA7xx board included yet.
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