sunxi-mali: new package

[Thomas: remove trailing whitespace, install libraries with execution
permissions so that they get stripped by Buildroot, r2p4 is only
available on EABI toolchains, r3p0 on EABIhf toolchains.]

Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>