staging: unisys: fix CamelCase names in struct efi_spar_indication

Fix CamelCase names and update all references to them:

BootToFirmwareUI => boot_to_fw_ui
ClearNvram => clear_nvram
ClearCmos => clear_cmos
BootToTool => boot_to_tool

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