powerpc/fsl: remove the PPC_CLOCK dependency

Config FSL_SOC does not depend on PPC_CLOCK anymore since the following
commit got merged: 93abe8e4 (clk: add non CONFIG_HAVE_CLK routines)
Config CPM does not use PPC_CLOCK either currently. So remove them.

PPC_CLOCK also keeps Freescale PowerPC archtecture from supporting COMMON_CLK.
Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/Kconfig

@@ -685,7 +685,6 @@ config SBUS
 config FSL_SOC
 	bool
 	select HAVE_CAN_FLEXCAN if NET && CAN
-	select PPC_CLOCK
 
 config FSL_PCI
  	bool

arch/powerpc/platforms/Kconfig

@@ -344,7 +344,6 @@ config FSL_ULI1575
 
 config CPM
 	bool
-	select PPC_CLOCK
 
 config OF_RTC
 	bool