[roll third_party/pigweed] third_party/boringssl: Add pw_third_party_boringssl_ALIAS GN arg

Add a GN arg, "pw_third_party_boringssl_ALIAS", that creates a build
target //third_party/boringssl:boringssl that simply has a public
dependency on "pw_third_party_boringssl_ALIAS". This fixes a diamond
dependency conflict in Fuchsia.

Original-Bug: 250920555
Test: I compiled fxr/788706 with this CL and ran all bt-host tests.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/126427

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: dc0e4b207516fe3..d07c15b6d3222c4
Roller-URL: https://ci.chromium.org/b/8792218534097127169
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4a06def03c283fb5d726a50cba4a1cbcca869fa0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/126473
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index dc0e4b2..d07c15b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit dc0e4b207516fe383b14c1380f7d357d4e0105cb
+Subproject commit d07c15b6d3222c4719af10fd77586b86801759b3