clover: implement SVM functions for devices with fine grained system SVM support

clover: implement SVM functions for devices with fine grained system SVM support

all of the functionality can be mapped to malloc/free if the device supports
fine grained system SVM.

v2: fix some API bugs found with the OpenCL CTS
v3: remove validate_even_wait_list
    improve implementation of clSetKernelExecInfo
    make clEnqueueSVMFree spec compliant
    rename can_emulate_non_system_svm to has_system_svm and make it a member method
    improve validation in clEnqueueSVMMemFill
    handle CL_MEM_USES_SVM_POINTER in clGetMemObjectInfo
v4: break long lines and other minor cosmetic adjustments

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2076>