Fixed argument passing in SetMPI/GetMPIData

[danielinux]

When compiling with wolfboot, I spotted the following:

lib/wolfPKCS11/src/internal.c: In function 'WP11_Object_SetEcKey':
lib/wolfPKCS11/src/internal.c:4725:26: error: passing argument 1 of 'SetMPI' from incompatible pointer type [-Werror=incompatible-pointer-types]
 4725 |             ret = SetMPI(&key->k, data[1], (int)len[1]);
      |                          ^~~~~~~
      |                          |
      |                          mp_int (*)[1] {aka sp_int (*)[1]}
lib/wolfPKCS11/src/internal.c:4506:27: note: expected 'mp_int *' {aka 'sp_int *'} but argument is of type 'mp_int (*)[1]' {aka 'sp_int (*)[1]'}
 4506 | static int SetMPI(mp_int* mpi, unsigned char* data, int len)
      |                   ~~~~~~~~^~~
lib/wolfPKCS11/src/internal.c: In function 'EcObject_GetAttr':
lib/wolfPKCS11/src/internal.c:5215:34: error: passing argument 1 of 'GetMPIData' from incompatible pointer type [-Werror=incompatible-pointer-types]
 5215 |                 ret = GetMPIData(&object->data.ecKey.k, data, len);
      |                                  ^~~~~~~~~~~~~~~~~~~~~
      |                                  |
      |                                  mp_int (*)[1] {aka sp_int (*)[1]}
lib/wolfPKCS11/src/internal.c:4922:31: note: expected 'mp_int *' {aka 'sp_int *'} but argument is of type 'mp_int (*)[1]' {aka 'sp_int (*)[1]'}
 4922 | static int GetMPIData(mp_int* mpi, byte* data, CK_ULONG* len)
      |                       ~~~~~~~~^~~
cc1: all warnings being treated as errors
make: *** [Makefile:314: lib/wolfPKCS11/src/internal.o] Error 1