ANDROID: android: Add symbols to debug_symbols driver

in our vendor driver, we need the following three kernel variables:
include/linuc/mm.h:
extern unsigned long stack_guard_gap;
extern int sysctl_legacy_va_layout;

include/linux/security.h:
extern unsigned long mmap_min_addr;

Bug: 191439466
Signed-off-by: xieliujie <xieliujie@oppo.com>
Change-Id: I9d1759d8157ddd214475742e417dfb9e870d4b2e