Revert "selftests/powerpc: Fix out-of-tree build errors"

This reverts commit d8a2fe29.

That commit, by me, fixed the out of tree build errors by causing some
of the tests not to build at all.

tools/testing/selftests/powerpc/cache_shape/Makefile

 # SPDX-License-Identifier: GPL-2.0
 TEST_PROGS := cache_shape
 
+all: $(TEST_PROGS)
+
 $(TEST_PROGS): ../harness.c ../utils.c
 
 top_srcdir = ../../../../..

tools/testing/selftests/powerpc/ptrace/Makefile

@@ -7,6 +7,8 @@ TEST_PROGS := ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
 top_srcdir = ../../../../..
 include ../../lib.mk
 
+all: $(TEST_PROGS)
+
 CFLAGS += -m64 -I../../../../../usr/include -I../tm -mhtm -fno-pie
 
 ptrace-pkey core-pkey: child.h

tools/testing/selftests/powerpc/signal/Makefile

 # SPDX-License-Identifier: GPL-2.0
 TEST_PROGS := signal signal_tm
 
+all: $(TEST_PROGS)
+
 $(TEST_PROGS): ../harness.c ../utils.c signal.S
 
 CFLAGS += -maltivec

tools/testing/selftests/powerpc/switch_endian/Makefile

@@ -8,7 +8,6 @@ EXTRA_CLEAN = $(OUTPUT)/*.o $(OUTPUT)/check-reversed.S
 top_srcdir = ../../../../..
 include ../../lib.mk
 
-$(OUTPUT)/switch_endian_test: ASFLAGS += -I $(OUTPUT)
 $(OUTPUT)/switch_endian_test: $(OUTPUT)/check-reversed.S
 
 $(OUTPUT)/check-reversed.o: $(OUTPUT)/check.o