TI:omap5/dra7xx: Convert to ti_armv7_common.h

Update omap5_common.h to use ti_armv7_common.h, and in turn update
dra7xx_evm.h and omap5_uevm.h slightly.  The biggest changes here are
that IP blocks which exist on the platform, and had clocks enabled,
now have the drivers being built as well.

Signed-off-by: Tom Rini <trini@ti.com>