Merge pull request #196 from ccli8/nuvoton_m2351_rename

Rename M2351 platform name to 'NU_PFM_M2351' from 'NUMAKER_PFM_M2351'

Author: mark-edgeworth

src/mbed_os_tools/detect/platform_database.py

@@ -225,7 +225,7 @@
         u"1302": u"NUMAKER_PFM_NUC472",
         u"1303": u"NUMAKER_PFM_M453",
         u"1304": u"NUMAKER_PFM_M487",
-        u"1305": u"NUMAKER_PFM_M2351",
+        u"1305": u"NU_PFM_M2351",
         u"1306": u"NUMAKER_PFM_NANO130",
         u"1307": u"NUMAKER_PFM_NUC240",
         u"1308": u"NUMAKER_IOT_M487",