m32r: bzip2/lzma kernel compression support

- Support bzip2 and lzma kernel compression for m32r.
- Clean up arch/m32r/boot/compressed/misc.c.

Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index c41234f..3a9319f 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -11,6 +11,9 @@
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select INIT_ALL_POSSIBLE
+	select HAVE_KERNEL_GZIP
+	select HAVE_KERNEL_BZIP2
+	select HAVE_KERNEL_LZMA
 
 config SBUS
 	bool