chromeos: vboot and chromeos dependency removal for sw write protect state

This removes the dependency on chromeos and vboot for the sw write protect state
function: vboot_get_sw_write_protect, renamed to get_sw_write_protect_state to
both reflect this change and become consistent with the definition of
get_write_protect_state that is already in use.

Change-Id: I47ce31530a03f6749e0f370e5d868466318b3bb6
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: http://review.coreboot.org/11496
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/skylake/romstage/romstage.c

@@ -68,15 +68,13 @@ void soc_romstage_init(struct romstage_params *params)
 	pch_early_init();
 }
 
-#if IS_ENABLED(CONFIG_CHROMEOS)
-int vboot_get_sw_write_protect(void)
+int get_sw_write_protect_state(void)
 {
 	u8 status;
 
 	/* Return unprotected status if status read fails. */
 	return early_spi_read_wpsr(&status) ? 0 : !!(status & 0x80);
 }
-#endif
 
 /* UPD parameters to be initialized before MemoryInit */
 void soc_memory_init_params(struct romstage_params *params,