TF-A Test Framework: Rename `ptrauth` to `pauth`

This patch renames folder and source file names according to
match with TF-A naming:
- `ptrauth` folder in `tftf\tests\extensions' renamed to `pauth`,
- `test_ptrauth.c` source file to `test_pauth.c`

Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Change-Id: Ida47e175e158e77e33270ee93ba6b3104eb0b5db
diff --git a/tftf/tests/tests-cpu-extensions.mk b/tftf/tests/tests-cpu-extensions.mk
index daf9528..cb4c1f9 100644
--- a/tftf/tests/tests-cpu-extensions.mk
+++ b/tftf/tests/tests-cpu-extensions.mk
@@ -10,5 +10,5 @@
 	extensions/sve/test_sve.c					\
 	runtime_services/arm_arch_svc/smccc_arch_workaround_1.c		\
 	runtime_services/arm_arch_svc/smccc_arch_workaround_2.c		\
-	extensions/ptrauth/test_ptrauth.c				\
+	extensions/pauth/test_pauth.c					\
 )