maliit-framework: Clean up recipe and use gtk-immodules-cache.bbclass

To be merged after gtk-immodules-cache.bbclass hits oe-core

Signed-off-by: Samuel Stirtzel <s.stirtzel@googlemail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>