Move the kernel from low address to 0xc0000000

Signed-off-by: Yang Yang <geraint0923@gmail.com>
Signed-off-by: Chen Yuheng <chyh1990@gmail.com>
clean sfs tmpdir and disable DDE by default
fix bugs in DDE and enable DDE mmc/fb by default
Fix USER_ACCESS to make the low address available

Fix the USERBASE and USERTEXT to low address like 0x00008000 to make the
user programs could be loaded at low address, which means that bionic.ld
could be removed from repo.
fix ARMv6 support in entry.S
Clean up commented legacy code and fix a compile warning

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Use uboot kernel image for arm

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
fix spinlock use in slob