powerpc/mpc85xx:Update FM1 clock select and shift for B4420

B4420 is a personality of B4860.
It should have same FM1_CLK_SEK and FM1_CLK_SHIFT as B4860
Signed-off-by: NPrabhakar Kushwaha <prabhakar@freescale.com>
Reviewed-by: NYork Sun <yorksun@freescale.com>

arch/powerpc/cpu/mpc85xx/speed.c

@@ -163,8 +163,8 @@ void get_sys_info(sys_info_t *sys_info)
 		sys_info->freq_processor[cpu] =
 			 freq_c_pll[cplx_pll] / core_cplx_pll_div[c_pll_sel];
 	}
-#if defined(CONFIG_PPC_B4860) || defined(CONFIG_PPC_T2080) || \
-	defined(CONFIG_PPC_T2081)
+#if defined(CONFIG_PPC_B4860) || defined(CONFIG_PPC_B4420) || \
+	defined(CONFIG_PPC_T2080) || defined(CONFIG_PPC_T2081)
 #define FM1_CLK_SEL	0xe0000000
 #define FM1_CLK_SHIFT	29
 #else