visualc: Add crypto_driver.h to project

A new header file for crypto drivers has been added, so we need to ensure
that the Visual Studio project files reference the new header.
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index 4d8b92a..301d333 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -225,6 +225,7 @@
     <ClInclude Include="..\..\include\mbedtls\x509_csr.h" />

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

     <ClInclude Include="..\..\include\psa\crypto.h" />

+    <ClInclude Include="..\..\include\psa\crypto_driver.h" />

     <ClInclude Include="..\..\include\psa\crypto_extra.h" />

     <ClInclude Include="..\..\include\psa\crypto_platform.h" />

     <ClInclude Include="..\..\include\psa\crypto_sizes.h" />