Fix non-functional teletext on some platforms, and standardise on HiResTTX across the board
Detail: * Neither of our native Cortex-A9 machines natively support 16 colour modes, so HiResTTX must be used since the kernel only supports >16 colour TTX when that option is on. * Our Cortex-A8 machines can do 16 colours, but we might as well switch them to HiResTTX as well since they've got plenty of horsepower to render it at that resolution. * That just leaves IOMD as the odd one out using low-res TTX. If hardware scrolling or VDU 23,18,1 is used then performance of hi-res TTX doesn't seem to be that much worse than low-res, so for consistency it's probably best to take the performance hit and run all platforms with HiResTTX. hdr/Machine/Machine - Updated as above. Also use TTX256 for Cortex-A9 so that the "native" mode 7 will be 256 colour instaed of 16 colour. Admin: Tested on Pandaboard, iMX6, BB-xM, StrongARM RiscPC Fixes lack of teletext on Pandaboard + iMX6 Version 2.73. Tagged as 'HdrSrc-2_73'
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