mmc: sdhci: convert sdhci_set_uhs_signaling() into a library function

Add sdhci_set_uhs_signaling() and always call the set_uhs_signaling
method.  This avoids quirks being added into sdhci_set_uhs_signaling().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
[Ulf Hansson] Resolved conflict
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>

diff --cc drivers/mmc/host/sdhci-acpi.c
Simple merge

diff --cc drivers/mmc/host/sdhci-bcm-kona.c
Simple merge

diff --cc drivers/mmc/host/sdhci-bcm2835.c
Simple merge

diff --cc drivers/mmc/host/sdhci-cns3xxx.c
Simple merge

diff --cc drivers/mmc/host/sdhci-dove.c
Simple merge

diff --cc drivers/mmc/host/sdhci-of-arasan.c
Simple merge

diff --cc drivers/mmc/host/sdhci-of-esdhc.c
Simple merge

diff --cc drivers/mmc/host/sdhci-of-hlwd.c
Simple merge

diff --cc drivers/mmc/host/sdhci-pci.c
Simple merge

diff --cc drivers/mmc/host/sdhci-pltfm.c
Simple merge

diff --cc drivers/mmc/host/sdhci-pxav2.c
Simple merge

diff --cc drivers/mmc/host/sdhci-pxav3.c
Simple merge

diff --cc drivers/mmc/host/sdhci-s3c.c
Simple merge

diff --cc drivers/mmc/host/sdhci-sirf.c
Simple merge

diff --cc drivers/mmc/host/sdhci-spear.c
Simple merge

diff --cc drivers/mmc/host/sdhci-tegra.c
Simple merge

diff --cc drivers/mmc/host/sdhci.c
Simple merge

diff --cc drivers/mmc/host/sdhci.h
Simple merge