manifest.xml: drop composer hal

to fix the following failure of the vts_treble_vintf_vendor_test module
    DeviceManifest/SingleHidlTest#HalIsServed/android_hardware_graphics_composer_2_3__IComposer_default_8
    DeviceManifest/SingleHidlTest#InterfaceIsReleased/android_hardware_graphics_composer_2_3__IComposer_default_8

As it's changed to use the drm_hwcomposer hwc3 implementation now.

Fixes: c196acbc5273 ("dragonboard: Use drm_hwcomposer hwc3 implementation")
Test: atest vts_treble_vintf_vendor_test

Change-Id: I586ae9fe0c847240156cfb9f571ea5eb84646ba2
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
1 file changed