PD#SWPL-12145
Problem:
When switch IRQ stack, there is a 16 bytes miss match of irq
stack. This may cause context not match some times;
Solution:
Save sp to right place
Verify:
X301
Change-Id: I75dfa5208cb3cec050c1568ac78ae2e783ca106b
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>