Split target/Config.in.arch into multiple Config.in.* in arch/

target/Config.in.arch had become too long, and we want to remove the
target/ directory. So let's move it to arch/ and split it this way:

 * An initial Config.in that lists the top-level architecture, and
   sources the arch-specific Config.in.<arch> files, as well as
   Config.in.common (see below)

 * One Config.in.<arch> per architecture, listing the CPU families,
   ABI choices, etc.

 * One Config.in.common that defines the gcc mtune, march, mcpu values
   and other hidden options.

[Peter: space->tab fix, mipsel64 little endian, mips3 as noted by Arnout]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

arch/Config.in.arm

@@ -0,0 +1,62 @@
+choice
+	prompt "Target Architecture Variant"
+	depends on BR2_arm || BR2_armeb
+	default BR2_generic_arm
+	help
+	  Specific CPU variant to use
+
+config BR2_generic_arm
+	bool "generic_arm"
+config BR2_arm7tdmi
+	bool "arm7tdmi"
+config BR2_arm610
+	bool "arm610"
+config BR2_arm710
+	bool "arm710"
+config BR2_arm720t
+	bool "arm720t"
+config BR2_arm920t
+	bool "arm920t"
+config BR2_arm922t
+	bool "arm922t"
+config BR2_arm926t
+	bool "arm926t"
+config BR2_arm10t
+	bool "arm10t"
+config BR2_arm1136jf_s
+	bool "arm1136jf_s"
+config BR2_arm1176jz_s
+	bool "arm1176jz-s"
+config BR2_arm1176jzf_s
+	bool "arm1176jzf-s"
+config BR2_cortex_a8
+	bool "cortex-A8"
+config BR2_cortex_a9
+	bool "cortex-A9"
+config BR2_sa110
+	bool "sa110"
+config BR2_sa1100
+	bool "sa1100"
+config BR2_xscale
+	bool "xscale"
+config BR2_iwmmxt
+	bool "iwmmxt"
+endchoice
+
+choice
+	prompt "Target ABI"
+	depends on BR2_arm || BR2_armeb
+	default BR2_ARM_EABI
+	help
+	  Application Binary Interface to use
+
+	  Note:
+	    Using OABI is discouraged.
+
+config BR2_ARM_EABI
+	bool "EABI"
+config BR2_ARM_OABI
+	bool "OABI"
+	depends on !BR2_GCC_VERSION_4_7_X
+endchoice
+