defconfig: apq8084: Change ATL1C to be module

Change Atheros L1C Gigabit Ethernet driver compilation
to be module. The driver is used on the 8084 platforms.
The driver has problems in monolithic mode, but is
working fine as a module.

Change-Id: I5c355553ad676a597b50b13e55ddbf00fd1433e2
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>