removing linker warning about PROGBITS

Author: aethaniel

cores/arduino/USB/samd21_device.c

@@ -34,8 +34,8 @@ extern "C"{
 //#define TRACE_DEVICE(x)	x
 #define TRACE_DEVICE(x)
 
-__attribute__((__aligned__(4)))   __attribute__((__section__(".bss_hram0"))) uint8_t udd_ep_out_cache_buffer[4][64];
-__attribute__((__aligned__(4)))   __attribute__((__section__(".bss_hram0"))) uint8_t udd_ep_in_cache_buffer[4][128];
+__attribute__((__aligned__(4))) /*__attribute__((__section__(".bss_hram0")))*/ uint8_t udd_ep_out_cache_buffer[4][64];
+__attribute__((__aligned__(4))) /*__attribute__((__section__(".bss_hram0")))*/ uint8_t udd_ep_in_cache_buffer[4][128];
 
 /**
  * USB SRAM data containing pipe descriptor table