m68k: mcf5227x: move CPU type to Kconfig and refactor config.mk

Move the CPU type config options from include/configs/M52277EVB.h
to arch/m68k/Kconfig and refactor the CPU flags select in
arch/m68k/cpu/mcf5227x/config.mk.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Alison Wang <alison.wang@freescale.com>
Cc: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index eecef95..a645d95 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -29,6 +29,9 @@
 config MCF5445x
 	bool
 
+config MCF5227x
+	bool
+
 # processor type
 config M5208
 	bool
@@ -87,11 +90,16 @@
 	bool
 	select MCF5445x
 
+config M52277
+	bool
+	select MCF5227x
+
 choice
 	prompt "Target select"
 
 config TARGET_M52277EVB
 	bool "Support M52277EVB"
+	select M52277
 
 config TARGET_M5235EVB
 	bool "Support M5235EVB"