UPSTREAM: arm64/efi: remove free_boot_services() and friends

Now that we are calling SetVirtualAddressMap() from the stub, there is no
need to reserve boot-only memory regions, which implies that there is also
no reason to free them again later.

Acked-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

(cherry picked from commit 3033b84596eaec0093b68c5711c265738eb0745d)
Signed-off-by: Tomasz Figa <tfiga@chromium.org>

Bug: 24475017

Change-Id: I78c022ebe327e1c937e8c3b1070ce794f3fd61a5
Signed-off-by: Kees Cook <keescook@google.com>