ndk: Remove MALLOC_LOW_MEMORY config for the ndk
This switches the ndk to using scudo instead of jemalloc.
Bug: 337242400
Test:
Built NDK and tested lldb-server on both 4k and 16k devices
```
$ cd aosp && mkdir ndk_prebuilts
$ export OUT_DIR=ndk_prebuilts
$ ./build/soong/scripts/build-ndk-prebuilts.sh
$ cp -r ~/aosp/ndk_prebuilts/soong/ndk/sysroot/*
~/llvm-project/toolchain/prebuilts/ndk/releases/r27/toolchains/llvm/prebuilt/linux-x86_64/sysroot/
$ cd ../llvm-project
$ python3 toolchain/llvm_android/build.py
$ adb push out/stage2-install/runtimes_ndk_cxx/aarch64/lldb-server /data/local/tmp/
$ adb shell "getconf PAGE_SIZE"
16384
$ adb shell "strace /data/local/tmp/lldb-server"
<output trimmed>
mprotect(<address redacted>, 16384, PROT_READ) = 0
exit_group(0) = ?
+++ exited with 0 +++
```
Change-Id: I982595278d70cb39b9f6c7c8e9b95f12723fc5bf
diff --git a/target/board/ndk/BoardConfig.mk b/target/board/ndk/BoardConfig.mk
index c7d9d4c..e367918 100644
--- a/target/board/ndk/BoardConfig.mk
+++ b/target/board/ndk/BoardConfig.mk
@@ -14,5 +14,3 @@
#
TARGET_ARCH_SUITE := ndk
-
-MALLOC_LOW_MEMORY := true