packages/Config.in: Change entries titles

This patch mostly fix the casing on different entries titles.
It also changes the name of "Misc devices firmwares" to a simpler
"Firmware".

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>