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

tinyusb/common/compiler/compiler.h

@@ -49,6 +49,7 @@
 #ifndef _TEST_
   #define STATIC_     static
   #define INLINE_     inline
+  #define ATTR_TEST_WEAK
 
   #if TUSB_CFG_DEBUG == 3
     #define ATTR_ALWAYS_INLINE // no inline for debug = 3
@@ -56,12 +57,13 @@
   #else
     #define STATIC_VAR static
   #endif
-  #define ATTR_TEST_WEAK
+
 #else
   #define ATTR_ALWAYS_INLINE
   #define STATIC_
   #define STATIC_VAR
   #define INLINE_
+
 #endif
 
 #if defined(__GNUC__)