ARM: 8942/1: Revert "8857/1: efi: enable CP15 DMB instructions before cleaning the cache"

This reverts commit e17b1af9

, which is
no longer necessary now that the v7 specific routines take care not to
issue CP15 barrier instructions before they are enabled in SCTLR.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>