ARM: OMAP2+: cm33xx.c: Remove some unused functions

Removes some functions that are not used anywhere:
am33xx_cm_read_reg_bits() am33xx_cm_clear_reg_bits() am33xx_cm_set_reg_bits()

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: NRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/cm33xx.c

@@ -72,27 +72,6 @@ static inline u32 am33xx_cm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx)
 	return v;
 }
 
-static inline u32 am33xx_cm_set_reg_bits(u32 bits, s16 inst, s16 idx)
-{
-	return am33xx_cm_rmw_reg_bits(bits, bits, inst, idx);
-}
-
-static inline u32 am33xx_cm_clear_reg_bits(u32 bits, s16 inst, s16 idx)
-{
-	return am33xx_cm_rmw_reg_bits(bits, 0x0, inst, idx);
-}
-
-static inline u32 am33xx_cm_read_reg_bits(u16 inst, s16 idx, u32 mask)
-{
-	u32 v;
-
-	v = am33xx_cm_read_reg(inst, idx);
-	v &= mask;
-	v >>= __ffs(mask);
-
-	return v;
-}
-
 /**
  * _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
  * @inst: CM instance register offset (*_INST macro)