bzip2/lzma: quiet Kconfig warning for INITRAMFS_COMPRESSION_NONE

Impact: quiet Kconfig warning

It appears that Kconfig simply has no way to provide defaults for
entries that exist inside a conditionalized choice block.
Fortunately, it turns out we don't actually ever use
CONFIG_INITRAMFS_COMPRESSION_NONE, so we can just drop it for
everything outside the choice block.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

usr/Makefile

@@ -6,9 +6,6 @@ klibcdirs:;
 PHONY += klibcdirs
 
 
-# No compression
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_NONE)   =
-
 # Gzip, but no bzip2
 suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP)   = .gz