change IAR TUSB_CFG_ATTR_USBRAM to _Pragma("location=\".ahb_sram1\"") instead of @ .ahb_sram1 so that we can place it before the variable for a cleaner code

change pipe xfer API buffer from void* to uint8_t*
change FIFO_DEF to have a separated buffer to be compatible with IAR\
refractor IAR data alignment pragma

demos/host/src/msc_app.c

@@ -57,7 +57,7 @@
 //--------------------------------------------------------------------+
 OSAL_TASK_DEF(msc_app_task, 512, MSC_APP_TASK_PRIO);
 
-static FATFS fatfs[TUSB_CFG_HOST_DEVICE_MAX] TUSB_CFG_ATTR_USBRAM;
+TUSB_CFG_ATTR_USBRAM static FATFS fatfs[TUSB_CFG_HOST_DEVICE_MAX];
 
 //--------------------------------------------------------------------+
 // tinyusb callback (ISR context)