Update section on semihosting parameters to cover RV128I

Closes: #18
Signed-off-by: Anup Patel <[email protected]>

src/binary-interface.adoc

@@ -52,15 +52,15 @@ sys_semihost:
 The type of semihosting operation and it's parameter are specified using
 general purpose registers. The <<register>> shows the specific registers
 that are used, and the size of the fields in the data block, which depend
-on whether the caller is 32-bit or 64-bit.
+on whether the caller is 32-bit or 64-bit or 128-bit.
 
 .RISC-V Registers and field size
 [#register]
-[cols="3,^1,^1"]
+[cols="3,^1,^1,^1"]
 |===
-|                                   | 32-bit | 64-bit
-| OPERATION NUMBER REGISTER         |  A0    |   A0  
-| PARAMETER REGISTER                |  A1    |   A1  
-| RETURN REGISTER                   |  A0    |   A0  
-| Data block field size             | 32 bits| 64 bits
+|                                   | 32-bit | 64-bit | 128-bit
+| OPERATION NUMBER REGISTER         |  A0    |   A0   |  A0
+| PARAMETER REGISTER                |  A1    |   A1   |  A1
+| RETURN REGISTER                   |  A0    |   A0   |  A0
+| Data block field size             | 32 bits| 64 bits| 128 bits
 |===