blackfin: Remove noreturn attribute from cpu_init_f()

Now that board_init_f() is not marked as noreturn, we need to do the same
to blackfin's cpu_init_f() function.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/blackfin/cpu/cpu.c

@@ -23,7 +23,6 @@
 
 ulong bfin_poweron_retx;
 
-__attribute__ ((__noreturn__))
 void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
 {
 #ifndef CONFIG_BFIN_BOOTROM_USES_EVT1