BACKPORT: media: v4l: move helper functions for fractions from uvc to v4l2-common

The functions uvc_simplify_fraction and uvc_fraction_to_interval are
generic helpers which are also useful for other v4l2 drivers. This patch
moves them to v4l2-common.

Tested-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220909221335.15033-2-m.grzeschik@pengutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 6ba8b8d45335180523df8f1b6cd1c995a3dbf560)
arakesh: resolved minor conflicts in include/media/v4l2-common.h and
         drivers/media/v4l2-core/v4l2-common.c
Bug: 259171206
Change-Id: I17eea1ef6788ba98599b1d8a12499147ebef7d60
Signed-off-by: Avichal Rakesh <arakesh@google.com>
Signed-off-by: Cyber Knight <cyberknight755@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>