target: align switch and case statements

The coding style requires the 'case' to be at the same indentation
level of its 'switch' statement.

Align the code accordingly.

While there:
- add space around the operators;
- drop useless empty line.

Skip all riscv code, as it is going to be updated soon from the
external fork.

No changes are reported by
	git log -p -w --ignore-blank-lines --patience

Change-Id: I2691dfdd2b6734143e14160b46183623e9773539
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9051
Tested-by: jenkins

src/target/mips_m4k.c

@@ -893,17 +893,17 @@ static int mips_m4k_set_watchpoint(struct target *target,
 	}
 
 	switch (watchpoint->rw) {
-		case WPT_READ:
-			enable &= ~EJTAG_DBCN_NOLB;
-			break;
-		case WPT_WRITE:
-			enable &= ~EJTAG_DBCN_NOSB;
-			break;
-		case WPT_ACCESS:
-			enable &= ~(EJTAG_DBCN_NOLB | EJTAG_DBCN_NOSB);
-			break;
-		default:
-			LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
+	case WPT_READ:
+		enable &= ~EJTAG_DBCN_NOLB;
+		break;
+	case WPT_WRITE:
+		enable &= ~EJTAG_DBCN_NOSB;
+		break;
+	case WPT_ACCESS:
+		enable &= ~(EJTAG_DBCN_NOLB | EJTAG_DBCN_NOSB);
+		break;
+	default:
+		LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
 	}
 
 	watchpoint_set(watchpoint, wp_num);