drivers/video/ssd1307fb.c: fix bit order bug in the byte translation function

drivers/video/ssd1307fb.c: fix bit order bug in the byte translation function

This was leading to a strange behaviour when using the fbcon driver on
top of this one: the letters were in the right order, but each letter
had a vertical symmetry.

This was because the addressing was right for the byte, but the
addressing of each individual bit was inverted.

Signed-off-by: Maxime Ripard <[email protected]>
Cc: Brian Lilly <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Florian Tobias Schandinat <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>