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Assigning a relative value to ios_sdk_platform_path does not work
as the variable is used by more than one target/config as some of
them are from a different level in the directory hierarchy (thus
they require a different rebased value).

Instead change build/config/mac/sdk_info.py to output a path that
is relative to root_source_dir (i.e. a path starting with //) and
fixes the different usage of the ios_sdk_platform_path variable
to do the rebase_path as required.

Bug: 1058221
Change-Id: I41545765dbf66efb96b8d00246bfe1856dba9bea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087219
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Simon Que <sque@chromium.org>
Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747181}