ANDROID: Allow vendor modules perform operationson on memleak detect

When an LMK (Low Memory Killer) occurs, it is crucial for us to identify
the underlying cause of low memory. Based on past experiences, memory
leaks are often the root cause in such situations. The purpose of this
function is to assist us in identifying which application or type of
memory is experiencing memory leaks, thereby enabling us to effectively
locate and address the memory leakage issue.

Bug: 365506689
Bug: 346707562
Change-Id: I5d7d6bdbca30660f2a552211fd8aff40d3550df7
Signed-off-by: jiangxinpei <jiangxinpei@honor.corp-partner.google.com>
(cherry picked from commit d61134668c2d37846a6cea3e1ab3c237f2c7bc99)

lib/show_mem.c

@@ -44,3 +44,4 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 #endif
 	trace_android_vh_show_mem(filter, nodemask);
 }
+EXPORT_SYMBOL_GPL(__show_mem);