OMAP4: clock data: Remove UNIPRO clock nodes

UNIPRO was removed from OMAP4 devices from ES2.0 onwards.
Since this IP was anyway non-functional and not supported,
it is best to remove it completely.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
[b-cousson@ti.com: Update the changelog]
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
[paul@pwsan.com: split PRCM header file changes into a separate patch]
Signed-off-by: Paul Walmsley <paul@pwsan.com>