Impact: Avoids silent environment dependency

Make builtin initramfs compression an explicit configurable.  The
previous version would pick a compression based on the binaries which
were installed on the system, which could lead to unexpected results.
It is now explicitly configured, and not having the appropriate
binaries installed on the build host is simply an error.
Signed-off-by: NAlain Knaff <alain@knaff.lu>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>

Impact: Partial resolution of build failure

Move the initrd/initramfs configuration options from
drivers/block/Kconfig to usr/Kconfig, since they do not and should not
depend on CONFIG_BLK_DEV.  This fixes builds when CONFIG_BLK_DEV=n.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Signed-off-by: Alexander E. Patrakov
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Move initramfs options from Device Drivers | Block Drivers to General Setup
This is a more natural place for this option.

Furthermore separate out intramfs options to usr/Kconfig
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>