feat[build]: Add --toolchain to config toolchain for linux

for example
./make-Makefiles.bash --toolchain gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-

Change-Id: I4804b1e1759aab04f715d826fbe412087298cb89
Signed-off-by: Yandong Lin <yandong.lin@rock-chips.com>

build/linux/arm/make-Makefiles.bash

@@ -24,7 +24,14 @@ fi
 
 # generate Makefile
 cmake -DCMAKE_BUILD_TYPE=Release \
+      -DTOOLCHAIN=${TOOLCHAIN} \
       -DCMAKE_TOOLCHAIN_FILE=./arm.linux.cross.cmake \
       -DHAVE_DRM=ON \
       -G "Unix Makefiles" \
       ${MPP_TOP}
+
+if [ "${CMAKE_PARALLEL_ENABLE}" = "0" ]; then
+    cmake --build .
+else
+    cmake --build . -j
+fi