chore(vg_lite): clean useless function and macro (#5346)

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>

tests/src/lv_test_conf.h

@@ -82,6 +82,9 @@ typedef void * lv_user_data_t;
 /* Simulate VG-Lite hardware using ThorVG */
 #define LV_USE_VG_LITE_THORVG       1
 
+/* VG-Lite GPU buffer alignment. */
+#define LV_DRAW_BUF_ALIGN           64
+
 #include "lv_test_conf_full.h"
 #elif LV_TEST_OPTION == 4
 #define  LV_COLOR_DEPTH     24
@@ -106,8 +109,10 @@ typedef void * lv_user_data_t;
 /*Use a large value be sure any issues will cause crash*/
 #define LV_DRAW_BUF_STRIDE_ALIGN                64
 
+#if !defined(LV_DRAW_BUF_ALIGN)
 /*Use non power of 2 to avoid the case when `malloc` returns aligned pointer by default, and use a large value be sure any issues will cause crash*/
 #define LV_DRAW_BUF_ALIGN                       852
+#endif
 
 /*For screenshots*/
 #undef LV_USE_PERF_MONITOR