renesas: support micros with different number of HW pipes

not all renesas micro have the same number of pipes as expected by the find_pipe function
for example see RA4M1 micro which only have 2 bulk pipes and 2 interrupt pipes
for this reason some defines were introduced so that the actual number and positions of USB HW pipes can be defined at build time for different kind of processor

using the ifndef ---> define mechanism allows to put sensible default values

Author: maidnl

Diff for: src/portable/renesas/rusb2/dcd_rusb2.c

@@ -89,6 +89,24 @@ static dcd_data_t _dcd;
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
 
+#ifndef FIRST_BULK_PIPE
+#define FIRST_BULK_PIPE       3
+#endif
+
+#ifndef FIRST_INTERRUPT_PIPE
+#define FIRST_INTERRUPT_PIPE  6
+#endif
+
+#ifndef NUMBER_OF_PIPES
+#define NUMBER_OF_PIPES       10
+#endif
+
+#ifdef NO_ISOCRONOUS_PIPE
+  #define FIRST_PIPE            FIRST_BULK_PIPE
+#else
+  #define FIRST_PIPE            1
+#endif
+
 // Transfer conditions specifiable for each pipe:
 // - Pipe 0: Control transfer with 64-byte single buffer
 // - Pipes 1 and 2: Bulk isochronous transfer continuous transfer mode with programmable buffer size up
@@ -97,9 +115,9 @@ static dcd_data_t _dcd;
 //   optional double buffer
 // - Pipes 6 to 9: Interrupt transfer with 64-byte single buffer
 enum {
-  PIPE_1ST_BULK = 3,
-  PIPE_1ST_INTERRUPT = 6,
-  PIPE_COUNT = 10,
+  PIPE_1ST_BULK = FIRST_BULK_PIPE,
+  PIPE_1ST_INTERRUPT = FIRST_INTERRUPT_PIPE,
+  PIPE_COUNT = NUMBER_OF_PIPES,
 };
 
 static unsigned find_pipe(unsigned xfer)