spl: atf: provide a bl2_plat_get_bl31_params_default()

Move the actual implementation of the bl2_plat_get_bl31_params() to its
own function. The weak function will just call the default
implementation. This has the advantage that board code can still call
the original implementation if it just want to modify minor things.

Signed-off-by: Michael Walle <michael@walle.cc>
diff --git a/common/spl/spl_atf.c b/common/spl/spl_atf.c
index df0a198..63af6a6 100644
--- a/common/spl/spl_atf.c
+++ b/common/spl/spl_atf.c
@@ -18,9 +18,9 @@
 #include <spl.h>
 #include <asm/cache.h>
 
-__weak struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl32_entry,
-						    uintptr_t bl33_entry,
-						    uintptr_t fdt_addr)
+struct bl31_params *bl2_plat_get_bl31_params_default(uintptr_t bl32_entry,
+						     uintptr_t bl33_entry,
+						     uintptr_t fdt_addr)
 {
 	static struct bl2_to_bl31_params_mem bl31_params_mem;
 	struct bl31_params *bl2_to_bl31_params;
@@ -77,6 +77,14 @@
 	return bl2_to_bl31_params;
 }
 
+__weak struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl32_entry,
+						    uintptr_t bl33_entry,
+						    uintptr_t fdt_addr)
+{
+	return bl2_plat_get_bl31_params_default(bl32_entry, bl33_entry,
+						fdt_addr);
+}
+
 static inline void raw_write_daif(unsigned int daif)
 {
 	__asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");