[SYCLomatic] Fix unsuccessful compilation of dpct::load_kernel_library_mem due to failed argument cast

[the-slow-one]

Here is the CUDA source and migrated SYCL code.

void test(CUmodule module, unsigned char* data) {
  cuModuleLoadData(&module, data);
}

#include <sycl/sycl.hpp>                                                                                                                                                                                                                                                                           #include <dpct/dpct.hpp>
void test(dpct::kernel_library module, unsigned char* data) {
  /*
  DPCT1104:0: 'data' should point to a dynamic library loaded in memory. The
  dynamic library should supply wrapped kernel functions.
  */
  module = dpct::load_kernel_library_mem(data);
}

icpx fails to compile the migrated code with following error.

dpct_output/src.dp.cpp:11:42: error: cannot initialize a parameter of type 'const char *' with an lvalue of type 'u8 *' (aka 'unsigned char *')
11 |   module = dpct::load_kernel_library_mem(data);
   |                                          ^~~~
/nfs/shm/proj/icl/cmplrarch/deploy_syclct/llorgsyclctefi2linux/20241125_160000/build/linux_qa_release/include/dpct/kernel.hpp:376:72: note: passing argument to parameter 'image' here
376 | static inline kernel_library load_kernel_library_mem(char const *const image) {
    |                                                                        ^
1 error generated.

This PR fixes this issue by explicitly casting the pointer the expected type.

Signed-off-by: Deepak Raj H R