[orch]: Change MLNX_PLATFORM_SUBSTRING to mellanox (sonic-net#345)

- Also update two LUA scripts to new names

Signed-off-by: Shu0T1an ChenG <[email protected]>

Author: Shuotian Cheng

orchagent/Makefile.am

@@ -5,8 +5,8 @@ CFLAGS_SAI = -I /usr/include/sai
 swssdir = $(datadir)/swss
 
 dist_swss_DATA = \
-		 pfc_detect_mlnx.lua  \
-		 pfc_restore_mlnx.lua
+		 pfc_detect_mellanox.lua  \
+		 pfc_restore_mellanox.lua
 
 bin_PROGRAMS = orchagent routeresync
 

orchagent/orch.h

@@ -24,7 +24,7 @@ const char ref_end             = ']';
 const char comma               = ',';
 const char range_specifier     = '-';
 
-#define MLNX_PLATFORM_SUBSTRING "mlnx"
+#define MLNX_PLATFORM_SUBSTRING "mellanox"
 
 typedef enum
 {