Merge pull request #133 from ashok-rao/MTB_STM_L475

Add STM_L475 MTB

Author: theotherjimmy

src/mbed_os_tools/detect/platform_database.py

@@ -104,6 +104,7 @@
         u"0462": u"MTB_USI_WM_BN_BM_22",
         u"0465": u"MTB_LAIRD_BL654",
         u"0466": u"MTB_MURATA_WSM_BL241",
+        u"0468": u"MTB_STM_L475",
         u"0472": u"MTB_ACONNO_ACN52832",
         u"0500": u"SPANSION_PLACEHOLDER",
         u"0505": u"SPANSION_PLACEHOLDER",