Pull up following revision(s) (requested by skrll in ticket #125):
	sys/dev/wsfb/genfb.c: revision 1.56
handle WSDISPLAYIO_GET_EDID and WSDISPLAYIO_GET_FBINFO only if the bus
frontend doesn't ( as in, returns EPASSTHROUGH or doesn't register a
handler )
Now flags passed from things like bcm2835_genfb.c are actually seen by
xf86-video-wsfb again and automatically disabling shadowfb works again,
which results in a major speedup on this kind of hardware.
Ticket #125
Pull up following revision(s) (requested by skrll in ticket #126):
	sys/arch/evbarm/rpi/rpi_machdep.c: revision 1.47
	sys/arch/arm/broadcom/bcm2835reg.h: revision 1.12
	sys/arch/evbarm/conf/RPI: revision 1.52
	sys/arch/evbarm/conf/RPI: revision 1.53
	sys/arch/evbarm/conf/RPI: revision 1.54
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.10
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.11
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.12
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.13
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.14
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.15
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.3
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.4
	sys/arch/arm/broadcom/bcm2835_dmac.h: revision 1.2
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.5
	sys/arch/arm/broadcom/bcm2835_emmc.c: revision 1.18
	sys/arch/arm/broadcom/bcm2835_dmac.h: revision 1.3
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.6
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.7
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.8
	sys/arch/arm/broadcom/bcm2835_dmac.c: revision 1.9
	sys/arch/arm/broadcom/files.bcm2835: revision 1.23
	sys/dev/sdmmc/sdhc.c: revision 1.45
	sys/dev/sdmmc/sdhc.c: revision 1.46
	sys/dev/sdmmc/sdhc.c: revision 1.47
	sys/dev/sdmmc/sdhcvar.h: revision 1.14
Various RPI DMAC and sdhc improvements.
Ticket #126