[nrf toup] crypto: Removed unused include

x509_csr.h seems to be unsed in CHIPCryptoPALPSA.cpp
so remove it.

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>

Author: Vge0rge

src/crypto/CHIPCryptoPALPSA.cpp

@@ -44,7 +44,6 @@
 #endif
 
 #include <mbedtls/error.h>
-#include <mbedtls/x509_csr.h>
 
 #include <string.h>
 #include <type_traits>