ANDROID: Delete FILES from build configs (amlogic)

Kleaf builds does not read the FILES variable. Instead, it relies on
kernel_build.*outs attributes to determine what files to be copied
from Kbuild's out directory.

Test: TH
Bug: 236012223
Change-Id: Ibd4ec2e8eee324d8617bd6c59599e18257c29f29
Signed-off-by: HONG Yifan <elsk@google.com>

build.config.amlogic

@@ -17,14 +17,6 @@ Image.gz
 dtbs
 "
 
-FILES="${FILES}
-arch/arm64/boot/Image.lz4
-arch/arm64/boot/dts/amlogic/meson-g12a-sei510*.dtb
-arch/arm64/boot/dts/amlogic/meson-sm1-sei610*.dtb
-arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l*.dtb
-arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3*.dtb
-"
-
 #
 # NOTE: Using Image.lz4 in MAKE_GOALS does not work because
 #   kernel build passes legacy option (-l) to lz4 command