selftests/powerpc: Add missing .gitignores

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/testing/selftests/powerpc/alignment/.gitignore

@@ -3,3 +3,4 @@ copy_first_unaligned
 paste_unaligned
 paste_last_unaligned
 copy_paste_unaligned_common
+alignment_handler

tools/testing/selftests/powerpc/tm/.gitignore

@@ -14,3 +14,4 @@ tm-signal-context-chk-vsx
 tm-vmx-unavail
 tm-unavailable
 tm-trap
+tm-sigreturn