Address various issues raised by TinyUSB maintainers

- remove OPT_MCU_SAME51 in favor of OPT_MCU_SAME5X and working around
  differences in the Atmel bsp locally in the D5035-01 bsp.

- rename board folder to d5035_01 for consistency with other boards

hw/bsp/board_mcu.h

@@ -53,14 +53,9 @@
   #include "nrf.h"
 
 #elif CFG_TUSB_MCU == OPT_MCU_SAMD11 || CFG_TUSB_MCU == OPT_MCU_SAMD21 || \
-      CFG_TUSB_MCU == OPT_MCU_SAMD51 || CFG_TUSB_MCU == OPT_MCU_SAME5X || \
-      CFG_TUSB_MCU == OPT_MCU_SAME51
+      CFG_TUSB_MCU == OPT_MCU_SAMD51 || CFG_TUSB_MCU == OPT_MCU_SAME5X
   #include "sam.h"
 
-  #if CFG_TUSB_MCU == OPT_MCU_SAME51
-    #define SVC_Handler SVCall_Handler
-  #endif
-
 #elif CFG_TUSB_MCU == OPT_MCU_SAMG
   #undef LITTLE_ENDIAN // hack to suppress "LITTLE_ENDIAN" redefined
   #include "sam.h"

hw/bsp/d5035_01/board.mk

@@ -9,14 +9,16 @@ CFLAGS += \
   -D__SAME51J19A__ \
   -DCONF_CPU_FREQUENCY=80000000 \
   -DCONF_GCLK_USB_FREQUENCY=48000000 \
-  -DCFG_TUSB_MCU=OPT_MCU_SAME51 \
+  -DCFG_TUSB_MCU=OPT_MCU_SAME5X \
   -DD5035_01=1 \
-  -DBOARD_NAME="\"D5035-01\""
+  -DBOARD_NAME="\"D5035-01\"" \
+  -DSVC_Handler=SVCall_Handler
 
-HWREV ?= 1
+HWRED ?= 1
 
 CFLAGS += -DHWREV=$(HWREV)
 
+
 # All source paths should be relative to the top level.
 LD_FILE = hw/bsp/$(BOARD)/same51j19a_flash.ld