package/usb_modeswitch: fix parallel install

package/usb_modeswitch: fix parallel install

Extract from bug report:

"In usb_modeswitch Makefile dispatcher-script, dispatcher-dynlink and
dispatcher-statlink are .PHONY targets. The result is that sources are
compiled also when install targets are called.
USB_MODESWITCH_INSTALL_TARGET_CMDS calls $(MAKE) which is a call to
parallel make eg. make -j9. So the install phase can install empty
usb_modeswitch binary (happened once) if the compiler have just cleared
the binary and install command installs it before compiler writes the
binary. USB_MODESWITCH_INSTALL_TARGET_CMDS should call $(MAKE1)."

Instead of disabling parellel install, use install-common target instead
of install-{dyn,stat}link targets. Indeed, the dynamic or static
usb_modeswitch_dispatcher binary will be built by
all-with-{dyn,stat}link-dispatcher targets, there is no need to rebuild
it during the install step

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=12911

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>