msm_geni_serial_console: Make early console depend on kernel console

Make early console depend on kernel console from the Kconfig
so that early console will be up only when kernel console is
either enabled (y) or a module (m).

Change-Id: Id480e39c55f18eb5d3b3175c9bf76fa0cc05174f
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>