esp32s2ulp: fix JUMPS offset interpretation (make same as JUMPR)

As per ESP32-S2 ULP coprocessor instruction set documentation, all
JUMP family instructions expect the address argument in 32-bit words.

For immediate values, JUMP and JUMPR do this as per documentation. In
other words an offset given in the assembly source in bytes is correctly
converted to 32-bit words (by doing >>2) when creating the binary
instruction.

With JUMPS however any value given in the assembly source file is kept
as-is when creating the binary instruction. Thus for example 4 bytes
specified in the source will stay 4 (32-bit words) in the binary
instruction, instead of 1 (32-bit word).

This commit fixes that behaviour. This also aligns the behaviour with
that of the ESP32 (not S2) assembler, where this already worked
correctly.

This change was tested on an actual ESP32-S2 with the following code:

```
.data
val: .long 0

.text
entry:
  move r3, val

  jumps 4, 42, lt

right:
  move r0, 66  # correct jump
  jump end
  nop
wrong:
  move r0, 73  # incorrect jump
  nop
end:
  st r0, r3, 0
  halt
```

Before the fix, the JUMPS instruction jumped 4 instructions forward,
and "val" was set to 73. After the fix JUMPS correctly jumped 1
instruction forward (4 bytes = 1 word), and "val" was set to 66.

Closes #3

gas/config/tc-esp32ulp_esp32s2.c

@@ -347,7 +347,7 @@ esp32ulp_cmd_jump_rels_esp32s2 (Expr_Node * step, Expr_Node * thresh,
   int step_val = EXPR_VALUE (step);
   int thresh_val = EXPR_VALUE (thresh);
   {
-    unsigned int local_op = I_JUMP_RELS (thresh_val, cond, step_val);
+    unsigned int local_op = I_JUMP_RELS (thresh_val, cond, step_val >> 2);
 
     INSTR_T result = conscode (gencode (local_op),
 			       conctcode (Expr_Node_Gen_Reloc (step,

gas/testsuite/gas/esp32ulp/esp32s2/compare/esp32s2ulp_jump.lst

@@ -87,8 +87,8 @@ ESP32ULP GAS  esp32s2ulp_jump.s 			page 1
   69      0000DE82 
   70              	
   71              	// Jumps commands...
-  72 00f0 04001288 	    jumps 0x4, 0x04, EQ
-  73 00f4 04001288 	    jumps 0x04, check_thres1, EQ
+  72 00f0 04000688 	    jumps 0x4, 0x04, EQ
+  73 00f4 04000688 	    jumps 0x04, check_thres1, EQ
   74 00f8 0400EA8A 	    jumps check_jump1, check_thres1, EQ
   75 00fc 0000EE8A 	    jumps check_jump1, check_thres2, EQ
   76 0100 0400F28A 	    jumps check_jump2, check_thres1, EQ
@@ -111,8 +111,8 @@ ESP32ULP GAS  esp32s2ulp_jump.s 			page 1
   91      00000A82 
   92              	
   93              	    //jumps with negative offset
-  94 0138 0000128A 	    jumps -0x4, 0x00, EQ
-  95 013c 0080108A 	    jumps -0x4, 0x00, LT
-  96 0140 0080118A 	    jumps -0x4, 0x00, GT
-  97 0144 0080128A 	    jumps -0x4, 0x00, LE
-  98 0148 0080138A 	    jumps -0x4, 0x00, GE
+  94 0138 0000068A 	    jumps -0x4, 0x00, EQ
+  95 013c 0080048A 	    jumps -0x4, 0x00, LT
+  96 0140 0080058A 	    jumps -0x4, 0x00, GT
+  97 0144 0080068A 	    jumps -0x4, 0x00, LE
+  98 0148 0080078A 	    jumps -0x4, 0x00, GE