Fix everest build

Fix everest build following the merge of
9490. By the way removed an unnecessary
link of the everest lib to mbedtls test
executable. It comes through the mbedtls
library that gets it from the tfpsacrypto
library.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

tests/CMakeLists.txt

@@ -1,6 +1,5 @@
 set(libs
     ${mbedtls_target}
-    ${everest_target}
     ${CMAKE_THREAD_LIBS_INIT}
 )
 

tf-psa-crypto/CMakeLists.txt

@@ -442,6 +442,7 @@ if(ENABLE_TESTING OR ENABLE_PROGRAMS)
         PRIVATE ${MBEDTLS_DIR}/include
         PRIVATE include
         PRIVATE drivers/builtin/include
+        PRIVATE drivers/everest/include
         PRIVATE core
         PRIVATE drivers/builtin/src)
     # Request C11, needed for memory poisoning tests