tests/amdgpu/basic_tests.c: change BUFFER_SIZE used in Userptr Test adjust to PAGE_SIZE
Userptr Test will fail on PAGE_SIZE bigger than BUFFER_SIZE(8 * 1024)
Signed-off-by: xinxu xinxu@loongson.cn
Userptr Test will fail on PAGE_SIZE bigger than BUFFER_SIZE(8 * 1024)
Signed-off-by: xinxu xinxu@loongson.cn