mb/*/*/smihandler: Remove bogus mainboard_io_trap_handler

These mainboard_io_trap_handler functions do nothing compared to a weak
mainboard_io_trap_handler in src/cpu/x86/smm/.

Change-Id: I73ebcc6c3f604a075a946503d51881ccc6820dac
Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36245
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/mainboard/apple/macbook21/smihandler.c

@@ -21,18 +21,6 @@
 
 #define GPE_EC_SCI	12
 
-int mainboard_io_trap_handler(int smif)
-{
-	switch (smif) {
-	default:
-		return 0;
-	}
-
-	/* On success, the IO Trap Handler returns 1
-	 * On failure, the IO Trap Handler returns a value != 1 */
-	return 1;
-}
-
 int mainboard_smi_apmc(u8 data)
 {
 	switch (data) {

src/mainboard/lenovo/s230u/smihandler.c

@@ -32,11 +32,6 @@
 /* FIXME: check this */
 #define GPE_EC_WAKE	13
 
-int mainboard_io_trap_handler(int smif)
-{
-	return 0;
-}
-
 enum sleep_states {
 	S0 = 0,
 	S1 = 1,

src/mainboard/packardbell/ms2290/smihandler.c

@@ -22,19 +22,6 @@
 #include <northbridge/intel/nehalem/nehalem.h>
 #include <ec/acpi/ec.h>
 
-int mainboard_io_trap_handler(int smif)
-{
-	switch (smif) {
-
-	default:
-		return 0;
-	}
-
-	/* On success, the IO Trap Handler returns 1
-	 * On failure, the IO Trap Handler returns a value != 1 */
-	return 1;
-}
-
 void mainboard_smi_gpi(u32 gpi_sts)
 {
 }