Move padlock.h to library

`padlock.h` is actually an internal header and is moved accordingly.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index 794150d..80a8cd1 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -182,7 +182,6 @@
     <ClInclude Include="..\..\include\mbedtls\net_sockets.h" />

     <ClInclude Include="..\..\include\mbedtls\nist_kw.h" />

     <ClInclude Include="..\..\include\mbedtls\oid.h" />

-    <ClInclude Include="..\..\include\mbedtls\padlock.h" />

     <ClInclude Include="..\..\include\mbedtls\pem.h" />

     <ClInclude Include="..\..\include\mbedtls\pk.h" />

     <ClInclude Include="..\..\include\mbedtls\pkcs11.h" />

@@ -240,6 +239,7 @@
     <ClInclude Include="..\..\library\common.h" />

     <ClInclude Include="..\..\library\ecp_alt.h" />

     <ClInclude Include="..\..\library\md_wrap.h" />

+    <ClInclude Include="..\..\library\padlock.h" />

     <ClInclude Include="..\..\library\pk_wrap.h" />

     <ClInclude Include="..\..\library\psa_crypto_core.h" />

     <ClInclude Include="..\..\library\psa_crypto_driver_wrappers.h" />