powerpc/vdso: Merge vdso64 and vdso32 into a single directory

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-284.30.1.el9_2
commit-author Christophe Leroy <[email protected]>
commit fd1fead
Empty-Commit: Cherry-Pick Conflicts during history rebuild.
Will be included in final tarball splat. Ref for failed cherry-pick at:
ciq/ciq_backports/kernel-5.14.0-284.30.1.el9_2/fd1feade.failed

merge vdso64 into vdso32 and rename it vdso.

	Reported-by: kernel test robot <[email protected]>
	Signed-off-by: Christophe Leroy <[email protected]>
	Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/4dbe05cc130f6a0858d09ac72e436c373cb08b70.1642782130.git.christophe.leroy@csgroup.eu

(cherry picked from commit fd1fead)
	Signed-off-by: Jonathan Maple <[email protected]>

# Conflicts:
#	arch/powerpc/kernel/Makefile

Author: PlaidCat