rp2/mpconfigport: Leave callable pointers alone on RV32.

The port configuration file tagged callable pointers' LSB on both Arm
and RISC-V variants.  This is needed on Arm due to Thumb/Thumb2
code addresses having their LSB set, but on RISC-V this is not required.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

ports/rp2/mpconfigport.h

@@ -275,7 +275,9 @@ extern const struct _mp_obj_type_t mod_network_nic_type_wiznet5k;
 #define MICROPY_HW_BOOTSEL_DELAY_US 8
 #endif
 
+#if PICO_ARM
 #define MICROPY_MAKE_POINTER_CALLABLE(p) ((void *)((mp_uint_t)(p) | 1))
+#endif
 
 #define MP_SSIZE_MAX (0x7fffffff)
 typedef intptr_t mp_int_t; // must be pointer size