fwupd: fix recursive dependency in Config.in

fwupd: fix recursive dependency in Config.in

The fwupd Config.in menu depends on PACKAGE_fwupd-libs, making
FWUPD_PLUGIN_FLASHROM implicitly depend on PACKAGE_fwupd-libs.
But fwupd-libs has a conditional dependency on libflashrom gated
by FWUPD_PLUGIN_FLASHROM, creating a circular dependency.

Fix by removing the depends on PACKAGE_fwupd-libs guard from the
Config.in menu and moving DEPENDS from Package/fwupd/Default into
Package/fwupd-libs directly. The menu options are always visible
in menuconfig but only take effect when fwupd-libs is selected.

Co-developed-by: Florian Eckert <redacted>
Signed-off-by: Joshua Klinesmith <redacted>
Co-Authored-By: Claude Opus 4.6 (1M context) <redacted>