m68k: mcf5445x: move CPU type to Kconfig and refactor config.mk

This commit intends to stop grepping CPU type in
arch/m68k/cpu/mcf5445x/config.mk.

Move the CPU type config options from include/configs/*.h
to arch/m68k/Kconfig and refactor the CPU flags select in
arch/m68k/cpu/mcf5445x/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 67308eb..eecef95 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -23,6 +23,12 @@
 config MCF537x
 	bool
 
+config MCF5441x
+	bool
+
+config MCF5445x
+	bool
+
 # processor type
 config M5208
 	bool
@@ -69,6 +75,18 @@
 	select MCF532x
 	select MCF537x
 
+config M54418
+	bool
+	select MCF5441x
+
+config M54451
+	bool
+	select MCF5445x
+
+config M54455
+	bool
+	select MCF5445x
+
 choice
 	prompt "Target select"
 
@@ -132,12 +150,15 @@
 
 config TARGET_M54418TWR
 	bool "Support M54418TWR"
+	select M54418
 
 config TARGET_M54451EVB
 	bool "Support M54451EVB"
+	select M54451
 
 config TARGET_M54455EVB
 	bool "Support M54455EVB"
+	select M54455
 
 config TARGET_M5475EVB
 	bool "Support M5475EVB"