edid: remove float use

First, we don't want floats in our code base.
Second, the calculation of the aspect ratio was wacky,
using a value guaranteed to be 0 for aspect ratio calculation.

While at it, define the aspect_* fields to be in tenths, to
provide some additional resolution. They were like that already
but we now also commit to that.

Change-Id: I5511adf4bf76cdd6a69240491372f220ef1aa687
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7803
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins)

src/include/edid.h

@@ -89,6 +89,7 @@ struct edid {
 	u32 bytes_per_line;
 	/* it is unlikely we need these things. */
 	/* if one of these is non-zero, use that one. */
+	/* they're aspect * 10 to provide some additional resolution */
 	unsigned int aspect_landscape;
 	unsigned int aspect_portrait;
 	const char *range_class;