kexec-tools: bump version from v2.0.4 to v2.0.9.

- kexec-tools is now distributed with tarballs of .tar.gz and .tar.xz
format; .tar.bz2 are not provided anymore.
- Add CONFIG_KEXEC_LZMA for selecting lzma support.

Patches are updated along to:

- Remove the now unnecessary patch 0004-mips_regdefs.patch.
- Drop 100-reduce_size.patch because the size reduction is marginal.
- Allow zlib and lzma support coexist together. This patch has been
merged into upstream project.
- Fix kexec-tools' configure.ac.
- Fix a few compilation warnings.

Size comparison of stripped binaries of kexec malta target with both
zlib and lzma support enabled.

- Before: 41447
- After: 42583

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44437 3c298f89-4303-0410-b956-a3cf2f4a3e73

kexec-tools: make zlib support optional, but enabled by default

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37071 3c298f89-4303-0410-b956-a3cf2f4a3e73

[boot] move boot related packages to their own folder

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33781 3c298f89-4303-0410-b956-a3cf2f4a3e73