ARM: OMAP2+: Drop unused legacy data for prcm_reg_id and module_bit

We are now using clock drivers in driver/clk/ti for enabling and disabling
modules and these are all unused.

Let's also remove the related unused defines in cm-regbits-24xx.h and
cm-regbits-34xx.h.

Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>