rockchip: support display

Implement VOP and eDP drivers, vop and edp clock configuration,
framebuffer allocation and display configuration logic.
The eDP driver reads panel EDID to determine panel dimensions
and the pixel clock used by the VOP.
The pixel clock is generating using the NPLL.

BUG=chrome-os-partner:31897
TEST=Booted Veyron Pinky and display normal
BRANCH=None

Change-Id: I01b5c347a3433a108806aec61aa3a875cab8c129
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e4f863b0b57f2f5293ea8015db86cf7f8acc5853
Original-Change-Id: I61214f55e96bc1dcda9b0f700e5db11e49e5e533
Original-Signed-off-by: huang lin <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/219050
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9553
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/soc/rockchip/rk3288/Makefile.inc b/src/soc/rockchip/rk3288/Makefile.inc
index d193783..836f2a7 100644
--- a/src/soc/rockchip/rk3288/Makefile.inc
+++ b/src/soc/rockchip/rk3288/Makefile.inc
@@ -66,6 +66,9 @@
 ramstage-y += media.c
 ramstage-y += rk808.c
 ramstage-y += pwm.c
+ramstage-y += vop.c
+ramstage-y += edp.c
+ramstage-y += display.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 
 CPPFLAGS_common += -Isrc/soc/rockchip/rk3288/include/