ARM: at91: introduce SAMA5 support

This patch introduces the SAMA5 support and a generic board file for SAMA5
devices. It also updates the PMC driver to manage clock division which is a
requirement since some peripherals can't work at the bus frequency on SAMA5.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/mach-at91/soc.h b/arch/arm/mach-at91/soc.h
index f3d3502..43a225f 100644
--- a/arch/arm/mach-at91/soc.h
+++ b/arch/arm/mach-at91/soc.h
@@ -22,6 +22,7 @@
 extern struct at91_init_soc at91sam9rl_soc;
 extern struct at91_init_soc at91sam9x5_soc;
 extern struct at91_init_soc at91sam9n12_soc;
+extern struct at91_init_soc sama5d3_soc;
 
 #define AT91_SOC_START(_name)				\
 struct at91_init_soc __initdata _name##_soc		\
@@ -68,3 +69,7 @@
 #if !defined(CONFIG_SOC_AT91SAM9N12)
 #define at91sam9n12_soc	at91_boot_soc
 #endif
+
+#if !defined(CONFIG_SOC_SAMA5D3)
+#define sama5d3_soc	at91_boot_soc
+#endif