build: optimize fatload build speed [1/1]

PD#SWPL-172042

Problem:
optimize fatload build speed

Solution:
1. use --lto=none
2. use --notrim
3. use --nokmi_symbol_list_strict_mode
4. reduce unnecessary constructions, such as system_dlkm and initramfs
5. modules, modules.dep and other files are copied from intermediate files

Verify:
local

Change-Id: Idb5c57a9a6ab357351341efb93fb6a79aeca5d0c
Signed-off-by: Wanwei Jiang <wanwei.jiang@amlogic.com>
4 files changed