Finish conversion of CONFIG_SYS_CLK_FREQ to Kconfig

In order to finish moving this symbol to Kconfig for all platforms, we
need to do a few more things.  First, for all platforms that define this
to a function, introduce CONFIG_DYNAMIC_SYS_CLK_FREQ, similar to
CONFIG_DYNAMIC_DDR_CLK_FREQ and populate clock_legacy.h.  This entails
also switching all users from CONFIG_SYS_CLK_FREQ to get_board_sys_clk()
and updating a few preprocessor tests.

With that done, all platforms that define a value here can be converted
to Kconfig, and a fall-back of zero is sufficiently safe to use (and
what is used today in cases where code may or may not have this
available).  Make sure that code which calls this function includes
<clock_legacy.h> to get the prototype.

Signed-off-by: Tom Rini <trini@konsulko.com>

boot/Kconfig

@@ -358,11 +358,27 @@ config SYS_TEXT_BASE
 	help
 	  The address in memory that U-Boot will be running from, initially.
 
-config SYS_CLK_FREQ
-	depends on ARC || ARCH_SUNXI || MPC83xx
-	int "CPU clock frequency"
+config DYNAMIC_SYS_CLK_FREQ
+	bool "Determine CPU clock frequency at run-time"
 	help
-	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
+	  Implement a get_board_sys_clk function that will determine the CPU
+	  clock frequency at run time, rather than define it statically.
+
+config SYS_CLK_FREQ
+	depends on !DYNAMIC_SYS_CLK_FREQ
+	int "CPU clock frequency"
+	default 125000000 if ARCH_LS1012A
+	default 100000000 if ARCH_P2020 || ARCH_T1024 || ARCH_T1042 || \
+			     ARCH_LS1021A || FSL_LSCH2 || FSL_LSCH3
+	default 66666666 if ARCH_P1010 || ARCH_P1020 || ARCH_T4240
+	default 66660000 if ARCH_T2080
+	default 33333333 if RCAR_GEN3
+	default 24000000 if ARCH_EXYNOS
+	default 20000000 if RCAR_GEN2
+	default 0
+	help
+	  A static value for the CPU frequency.  Note that if not required
+	  for a given SoC, this can be left at 0.
 
 config ARCH_FIXUP_FDT_MEMORY
 	bool "Enable arch_fixup_memory_banks() call"