contrib/saa7134: adds a parser for saa7134 logs

contrib/saa7134: adds a parser for saa7134 logs

Adds a parser to get saa7134 logs generated by PCI traffic patches,
at contrib/pci_traffic, like:

1286074716 slow_bar_writel: slow_bar_writel addr=0x0000000000000104 val=0x00009090
1286074716 slow_bar_writel: slow_bar_writel addr=0x0000000000000108 val=0x44804098
1286074716 slow_bar_writel: slow_bar_writel addr=0x000000000000010c val=0x2a810040
1286074716 slow_bar_writel: slow_bar_writel addr=0x0000000000000110 val=0x00000006

Converting them into something more easy to read, like:

saa_writel(SAA7134_ANALOG_IN_CTRL3, 0x9090);
saa_writel(SAA7134_SYNC_CTRL, 0x44804098);
saa_writel(SAA7134_DEC_CHROMA_SATURATION, 0x2a810040);
saa_writel(SAA7134_CHROMA_CTRL2, 0x0006);

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>