OMAP2/3 clkdm/pwrdm: move wkdep/sleepdep handling from pwrdm to clkdm

Move clockdomain wakeup dependency and sleep dependency data
structures from the powerdomain layer to the clockdomain layer, where
they belong.  These dependencies were originally placed in the
powerdomain layer due to unclear documentation; however, it is clear
now that these dependencies are between clockdomains.  For OMAP2/3,
this is not such a big problem, but for OMAP4 this needs to be fixed.

Thanks to Benoît Cousson <b-cousson@ti.com> for his advice on this
patch.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>

arch/arm/mach-omap2/prcm.c

@@ -199,6 +199,18 @@ u32 prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
 	return v;
 }
 
+/* Read a PRM register, AND it, and shift the result down to bit 0 */
+u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
+{
+	u32 v;
+
+	v = prm_read_mod_reg(domain, idx);
+	v &= mask;
+	v >>= __ffs(mask);
+
+	return v;
+}
+
 /* Read a register in a CM module */
 u32 cm_read_mod_reg(s16 module, u16 idx)
 {