Change target name not use low cases

Rev.101 mbed library support WIZnet platfrom.  However, we got build
error as below by online compiler:

Target “WIZWIKI_W7500” is not recognized

This is because target name contained low cases (e.g. WIZwiki_W7500).
The target name should be all upper case.

workspace_tools/build_release.py

@@ -105,7 +105,7 @@ OFFICIAL_MBED_LIBRARY_BUILD = (
     ('MAXWSNENV', ('ARM', 'GCC_ARM', 'IAR')),
     ('MAX32600MBED', ('ARM', 'GCC_ARM', 'IAR')),
 
-    ('WIZwiki_W7500',   ('ARM', 'uARM')),
+    ('WIZWIKI_W7500',   ('ARM', 'uARM')),
 )
 
 

workspace_tools/targets.py

@@ -71,7 +71,7 @@ class Target:
         pass
 ##WIZnet
 
-class WIZwiki_W7500(Target):
+class WIZWIKI_W7500(Target):
     def __init__(self):
         Target.__init__(self)
         self.core = "Cortex-M0"
@@ -1254,7 +1254,7 @@ class EFM32HG_STK3400(Target):
 TARGETS = [
 
     ### WIZnet ###
-    WIZwiki_W7500(),
+    WIZWIKI_W7500(),
     
     ### NXP ###
     LPC11C24(),