ARM: OMAP2+: clock data: add some aliases for use by CPUFreq only

These clkdev aliases should make it possible to remove the
cpu_is_omap*() calls and the omap_device*() call from
drivers/cpufreq/omap-cpufreq.c during the next merge window.  Those
are interfering with multi-subarch ARM kernels.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Kevin Hilman <khilman@ti.com>