1. Updated mcpwm & lwip.

2. Fixed the problem of duplicated LWIP_RAND.

extras/mcpwm

@@ -1 +1 @@
-Subproject commit 626f547cd748dc8bab1d29ee9d06c5cb8d5ae421
+Subproject commit 0f76d8141318899388c990c45c347ae5f37b9c07

lwip/include/arch/cc.h

@@ -101,6 +101,8 @@ typedef int sys_prot_t;
 #define LWIP_PLATFORM_HTONS(_n)  ((u16_t)((((_n) & 0xff) << 8) | (((_n) >> 8) & 0xff)))
 #define LWIP_PLATFORM_HTONL(_n)  ((u32_t)( (((_n) & 0xff) << 24) | (((_n) & 0xff00) << 8) | (((_n) >> 8)  & 0xff00) | (((_n) >> 24) & 0xff) ))
 
+#ifndef LWIP_RAND
 #define LWIP_RAND()                         hwrand()
+#endif
 
 #endif /* __ARCH_CC_H__ */

lwip/lwip

@@ -1 +1 @@
-Subproject commit 74676d46f0bc5ed82515f8e247008b7c45ec6cf6
+Subproject commit e5bf00eab33ad371994368dbe53f7b2d456ec884