exception: fix ipc timeout issue on bdw

It is a regression issue. L1 interrupt is used by SSP on bdw,
so don't register it as a exception.

Signed-off-by: Rander Wang <rander.wang@linux.intel.com>

Author: RanderWang

src/arch/xtensa/init.c

@@ -64,8 +64,6 @@ static void register_exceptions(void)
 		EXCCAUSE_INSTR_ERROR, (void *)&exception);
 	_xtos_set_exception_handler(
 		EXCCAUSE_LOAD_STORE_ERROR, (void *)&exception);
-	_xtos_set_exception_handler(
-		EXCCAUSE_LEVEL1_INTERRUPT, (void *)&exception);
 	_xtos_set_exception_handler(
 		EXCCAUSE_ALLOCA, (void *)&exception);
 	_xtos_set_exception_handler(