sh: sh7722 clock framework rewrite

This patch rewrites the sh7722 clock framework code.
The new code makes use of the recently merged div4,
div6 and mstp32 helper code. Both extal and dll are
supported as input clocks to the pll.

While at it, now when all SuperH Mobile processors
are converted, fix CONFIG_SH_CLK_CPG_LEGACY to depend
on CONFIG_ARCH_SHMOBILE.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -516,7 +516,7 @@ config SH_CLK_CPG
 
 config SH_CLK_CPG_LEGACY
 	depends on SH_CLK_CPG
-	def_bool y if !CPU_SUBTYPE_SH7785 && !CPU_SUBTYPE_SH7723 && !CPU_SUBTYPE_SH7724 && !CPU_SUBTYPE_SH7343 && !CPU_SUBTYPE_SH7366
+	def_bool y if !CPU_SUBTYPE_SH7785 && !ARCH_SHMOBILE
 
 config SH_CLK_MD
 	int "CPU Mode Pin Setting"