8xxx-fdt: set ns16550 clock from CFG_NS16550_CLK, not bi_busfreq

Some boards that have external 16550 UARTs don't have a direct
tie between bi_busfreq and the clock used for the UARTs.  Boards
that do have such a tie should set CFG_NS16550_CLK to be
get_bus_freq(0) -- which most of them do already.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>

cpu/mpc83xx/fdt.c

@@ -78,7 +78,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-		"clock-frequency", bd->bi_busfreq, 1);
+		"clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 
 	fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);

cpu/mpc85xx/fdt.c

@@ -229,7 +229,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-		"clock-frequency", bd->bi_busfreq, 1);
+		"clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 
 #ifdef CONFIG_CPM2

cpu/mpc86xx/fdt.c

@@ -30,6 +30,6 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-			       "clock-frequency", bd->bi_busfreq, 1);
+			       "clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 }