use new sdbus++ camelcase for CSR.

Change I17a8d7479556596a3cf252b3f4eae9c8df547189 will change
how sdbus++ generates names which start with an acronym.
Prepare for this by keying off the SDBUSPP_NEW_CAMELCASE
define to use the new format.

Changes:
    cSR() -> csr()

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9adb628d7d064af9f65d37aebe99e06532690163
diff --git a/bmc-vmi-ca/ca_cert_entry.hpp b/bmc-vmi-ca/ca_cert_entry.hpp
index 245a5cc..ad7ffce 100644
--- a/bmc-vmi-ca/ca_cert_entry.hpp
+++ b/bmc-vmi-ca/ca_cert_entry.hpp
@@ -50,7 +50,11 @@
         bus(bus), id(entryId), manager(manager)
 
     {
+#ifdef SDBUSPP_NEW_CAMELCASE
+        this->csr(csr);
+#else
         cSR(csr);
+#endif
         clientCertificate(cert);
 
         // Emit deferred signal.