Add ability to choose compression type for initramfs
Add '-c' option to gen_initramfs.sh to choose the compression type. Currently, it supports the following types: gzip (default), bzip2, lzma, and none. The toplevel Makefile now has a variable to specify the compression type of the initramfs, and passes it to gen_initramfs.sh. Currently it is set to lzma by default.
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