at91sam9/at91cap: improve clock framework

calculate dynamically the clock rate and pllb setting for usb

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/lib_arm/board.c b/lib_arm/board.c
index 3dfaec0..6847ea8 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -262,6 +262,9 @@
 
 init_fnc_t *init_sequence[] = {
 	cpu_init,		/* basic cpu dependent setup */
+#if defined(CONFIG_ARCH_CPU_INIT)
+	arch_cpu_init,		/* basic arch cpu dependent setup */
+#endif
 	board_init,		/* basic board dependent setup */
 	interrupt_init,		/* set up exceptions */
 	env_init,		/* initialize environment */