soc/intel/broadwell: Fix {}, () and conditional issues

Fix the following errors and warnings detected by checkpatch:

ERROR: open brace '{' following struct go on the same line
ERROR: return is not a function, parentheses are not required
ERROR: do not use assignment in if condition
ERROR: trailing statements should be on next line
WARNING: else is not generally useful after a break or return
WARNING: braces {} are not necessary for single statement blocks
WARNING: braces {} are not necessary for any arm of this statement

TEST=None

Change-Id: I9414341b0c778c252db33f0ef4847b9530681d96
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18884
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/soc/intel/broadwell/refcode.c

@@ -48,9 +48,8 @@ static pei_wrapper_entry_t load_reference_code(void)
 		.prog = &prog,
 	};
 
-	if (acpi_is_wakeup_s3()) {
+	if (acpi_is_wakeup_s3())
 		return load_refcode_from_cache();
-	}
 
 	if (prog_locate(&prog)) {
 		printk(BIOS_DEBUG, "Couldn't locate reference code.\n");