Update build scripts for error.c generation

This commit updates the build scripts for error.c generation to be
generated in the Mbed TLS library directory.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/library/Makefile b/library/Makefile
index e9c908e..d69f9e0 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -6,7 +6,7 @@
 TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH = $(MBEDTLS_PATH)/tf-psa-crypto/drivers/builtin/src
 
 GENERATED_FILES := \
-	$(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.c \
+	error.c \
 	version_features.c \
 	ssl_debug_helpers_generated.c \
 	$(TF_PSA_CRYPTO_CORE_PATH)/psa_crypto_driver_wrappers.h \
@@ -148,7 +148,7 @@
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/ecp_curves_new.o \
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/entropy.o \
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/entropy_poll.o \
-	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.o \
+	     error.o \
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/gcm.o \
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/hkdf.o \
 	     $(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/hmac_drbg.o \
@@ -357,10 +357,10 @@
 gen_file_dep = |
 endif
 
-$(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.c: $(gen_file_dep) ../scripts/generate_errors.pl
-$(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.c: $(gen_file_dep) ../scripts/data_files/error.fmt
-$(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.c: $(gen_file_dep) $(filter-out %config%,$(wildcard ../include/mbedtls/*.h))
-$(TF_PSA_CRYPTO_DRIVERS_BUILTIN_SRC_PATH)/error.c:
+error.c: $(gen_file_dep) ../scripts/generate_errors.pl
+error.c: $(gen_file_dep) ../scripts/data_files/error.fmt
+error.c: $(gen_file_dep) $(filter-out %config%,$(wildcard ../include/mbedtls/*.h))
+error.c:
 	echo "  Gen   $@"
 	$(PERL) ../scripts/generate_errors.pl