staging: unisys: clean up vmcall functions

Clean up the format of the vmcall functions in iovmcall_gnuc.h. These functions
are rewritten for clarity and to correct the indention, without changing any
functionality.

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>