Replace hlt with halt()

There were instances of unneeded arch/hlt.h includes,
various hlt() calls that weren't supposed to exit (but
might have) and various forms of endless loops around
hlt() calls.

All these are sorted out now: unnecessary includes are
dropped, hlt() is uniformly replaced with halt() (except
in assembly, obviously).

Change-Id: I3d38fed6e8d67a28fdeb17be803d8c4b62d383c5
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7608
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Drop tianocoreboot ("Project PIANO")

There are four other approaches to provide UEFI on
top of coreboot that actually get to a UEFI shell.
No need to keep this experiment and confuse users.

Change-Id: I81c52e24099852f6daf0d5725aec707bdfd75ae1
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7622
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
nvramtool: make sure that strings are 0-terminated

The call site expects them to be.

Change-Id: Ic05fc5831f5743d94fe617dfb3b9e329f01866d1
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7621
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>