Rename <pk/md/cipher>_internal.h to *_wrap.h

Revert changes introduced in 50518f419589d2c4746f4b6d6be0a2569a3386a8
as it is now clear that these headers are internal without the
`*_internal.h` suffix.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index 3459397..8313c11 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -236,11 +236,11 @@
     <ClInclude Include="..\..\tests\include\test\drivers\test_driver.h" />

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

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

-    <ClInclude Include="..\..\library\cipher_internal.h" />

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

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

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

-    <ClInclude Include="..\..\library\md_internal.h" />

-    <ClInclude Include="..\..\library\pk_internal.h" />

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

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

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

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

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