checkasm: add unit tests for v210enc

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

tests/checkasm/checkasm.h

@@ -32,6 +32,7 @@
 void checkasm_check_bswapdsp(void);
 void checkasm_check_h264pred(void);
 void checkasm_check_h264qpel(void);
+void checkasm_check_v210enc(void);
 
 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);
 int checkasm_bench_func(void);