alpha: Fix bootpfile and bootpzfile make targets

Fix the bootpfile and bootpzfile make targets to creat BOOTP images.
Both targets were broken due to some missing defines to re-map ELF
constants. In addition the old code used the generic vsprintf function
of the kernel which we now replace by a simple and much smaller
implementation for the bootloader.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Matt Turner <mattst88@gmail.com>

diff --cc arch/alpha/boot/Makefile
Simple merge

diff --cc arch/alpha/boot/main.c
Simple merge

diff --cc arch/alpha/boot/stdio.c
Simple merge

diff --cc arch/alpha/boot/tools/objstrip.c
Simple merge