Drop prt_mpc5xxx_clks() in favour of print_cpuinfo()

Rather than having an arch-specific function, use the existing generic
one.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index 7273c3f..9067d1e 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -385,7 +385,7 @@
 
 config DISPLAY_CPUINFO
 	bool "Display information about the CPU during start up"
-	default y if ARM || BLACKFIN || NIOS2 || X86 || XTENSA
+	default y if ARM || BLACKFIN || NIOS2 || X86 || XTENSA || MPC5xxx
 	help
 	  Display information about the CPU that U-Boot is running on
 	  when U-Boot starts up. The function print_cpuinfo() is called