soc/intel/common: Remove parenthesis

Fix the following error detected by checkpatch.pl:

ERROR: return is not a function, parentheses are not required

TEST=Build and run on Galileo Gen2

Change-Id: Idf7723d4fd48124a26bbb626afc310820f859f66
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18757
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/common/acpi/acpi.c

@@ -109,7 +109,7 @@ __attribute__((weak)) acpi_tstate_t *soc_get_tss_table(int *entries)
 __attribute__((weak)) uint16_t soc_get_acpi_base_address(void)
 {
 #define ACPI_BASE_ADDR 0x400
-	return (ACPI_BASE_ADDR);
+	return ACPI_BASE_ADDR;
 }
 
 static int calculate_power(int tdp, int p1_ratio, int ratio)