aocpu: clear libc Kconfig and CMakeLists dependencies [2/6]

PD#SWPL-92088

Problem:
clear Kconfig and CMakeLists dependencies for aocpu

Solution:
clear Kconfig and CMakeLists dependencies for aocpu

Verify:
N/A

Change-Id: I2b356fcd332b15597efbf783611a2d223b0996db
Signed-off-by: xiaohu.huang <xiaohu.huang@amlogic.com>
diff --git a/prj.conf b/prj.conf
index e9c8928..36986cd 100644
--- a/prj.conf
+++ b/prj.conf
@@ -5,7 +5,4 @@
 #
 
 #CONFIG_LIBC_AML and CONFIG_LIBC_STD must has one to be selected
-CONFIG_LIBC_AML=y
-CONFIG_LIBC_STD=n
-CONFIG_OSAL=n
-
+CONFIG_LIBC=y