feat(kernel): 补充assert.c

【背景】
补充assert.c
【修改方案】
BUILD.gn中取消对assert.c屏蔽，assert.c中删除__assert和__assert2接口（这两
接口不是musl标准接口）。
【影响】
对现有的产品编译不会有影响。

re #I42HM7
Signed-off-by: Nlnlanc <lanleinan@163.com>
Change-Id: I630761bb2cadb83a15c1de3767a1cda292176fff

porting/liteos_m/kernel/BUILD.gn

@@ -52,7 +52,7 @@ static_library(libc) {
     "src/network/ntohl.c",
     "src/network/ntohs.c",
     "src/exit/abort.c",
-    #"src/exit/assert.c",
+    "src/exit/assert.c",
     "src/ctype/isascii.c",
     "src/ctype/isxdigit.c",
     "src/ctype/isdigit.c",

porting/liteos_m/kernel/src/exit/assert.c

@@ -2,19 +2,6 @@
 #include "los_context.h"
 #include "los_debug.h"
 
-
-void __assert(const char* file, int line, const char* expr) {
-  PRINT_ERR("__assert error: %s, %d, %s\n", file, line, expr);
-  LOS_Panic("__assert error:\n");
-  while (1);
-}
-
-void __assert2(const char* file, int line, const char* func, const char* expr) {
-  PRINT_ERR("%s:%d: %s: assertion \"%s\" failed\n", file, line, func, expr);
-  LOS_Panic("__assert error:\n");
-  while (1);
-}
-
 void __assert_fail(const char* expr, const char* file, int line, const char* func) {
   PRINT_ERR("%s:%d: %s: assertion \"%s\" failed\n", file, line, func, expr);
   LOS_Panic("__assert error:\n");