perl: Remove ccache handling

Now the ccache handling has moved to the toolchain wrapper, it is no
longer necessary to pass TARGET_CC_NOCCACHE.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>