Add aligned_alloc to libc.

Bug: 72969374

Test: Bionic unit tests pass.
Test: Malloc debug unit tests pass.
Change-Id: I235985bbc638855d94249c97c98f14ab2924bda0
(cherry picked from commit d69ee59594088c0d92ba9273188ef53ea5e6cd6a)
diff --git a/libc/libc.arm.map b/libc/libc.arm.map
index 839c406..a7977eb 100644
--- a/libc/libc.arm.map
+++ b/libc/libc.arm.map
@@ -1322,6 +1322,7 @@
   global:
     __freading;
     __fwriting;
+    aligned_alloc;
     endhostent;
     endnetent;
     endprotoent;