MIPS: kconfig: merge targets qemu_mips and qemu_mips64

Now the user can separately select the CPU type. Thus the
targets qemu_mips and qemu_mips64 can be merged to a single
target.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/board/qemu-mips/Kconfig b/board/qemu-mips/Kconfig
index 394534f..18d78b5 100644
--- a/board/qemu-mips/Kconfig
+++ b/board/qemu-mips/Kconfig
@@ -4,19 +4,7 @@
 	default "qemu-mips"
 
 config SYS_CONFIG_NAME
-	default "qemu-mips"
-
-endif
-
-if TARGET_QEMU_MIPS64
-
-config SYS_CPU
-	default "mips64"
-
-config SYS_BOARD
-	default "qemu-mips"
-
-config SYS_CONFIG_NAME
-	default "qemu-mips64"
+	default "qemu-mips" if 32BIT
+	default "qemu-mips64" if 64BIT
 
 endif