src/arch/mips: Fix checkpatch warnings and errors

This patch will fix these checkpatch errors in src/arch/mips/.
- src/arch/mips/ashldi3.c:22: WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
- src/arch/mips/bootblock_simple.c:35: WARNING: braces {} are not necessary for any
arm of this statement

Change-Id: Ic859913b93dc8ed6ff64b551c8a6baf72d28c75a
Signed-off-by: Asami Doi <d0iasm.pub@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31938
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/arch/mips/ashldi3.c

@@ -19,7 +19,7 @@
 #errror "What endian are you!?"
 #endif
 
-typedef unsigned word_type;
+typedef unsigned int word_type;
 long long __ashldi3(long long u, word_type b);
 
 struct DWstruct {

src/arch/mips/bootblock_simple.c

@@ -32,10 +32,10 @@ void main(void)
 
 	bootblock_mmu_init();
 
-	if (init_extra_hardware()) {
+	if (init_extra_hardware())
 		printk(BIOS_ERR, "bootblock_simple: failed to init HW.\n");
-	} else {
+	else
 		run_romstage();
-	}
+
 	halt();
 }