Limit ringbuffer size in Trusty

The allocation ringbuffer has a size of 32768 entries by default,
totalling over a megabyte. In addition, a recent change moved
this buffer from .bss to being dynamically allocated, which means
it counts against the min_heap setting in the app manifest.

Bug: 265957160
Change-Id: Ib71f1565810bb5704131d7eefac54e4c5e0afa02

Author: marcone

standalone/flags.inc

@@ -55,5 +55,10 @@ SCUDO_FLAG(int, soft_rss_limit_mb, 0,
            "subsequent calls will fail or return NULL until the RSS goes below "
            "the soft limit")
 
+#if SCUDO_TRUSTY
+SCUDO_FLAG(int, allocation_ring_buffer_size, 1,
+           "Entries to keep in the allocation ring buffer for scudo.")
+#else
 SCUDO_FLAG(int, allocation_ring_buffer_size, 32768,
            "Entries to keep in the allocation ring buffer for scudo.")
+#endif